Upload
others
View
17
Download
0
Embed Size (px)
Citation preview
Nokia 2-mm DC Charging Interface Specification
F O R U M N O K I A
Version 1.2; August 22, 2006
Charging Interface
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 2
Copyright © 2005–2006 Nokia Corporation. All rights reserved.
Nokia and Forum Nokia are registered trademarks of Nokia Corporation. Other product and company names mentioned herein may be trademarks or trade names of their respective owners.
Disclaimer
The information in this document is provided “as is,” with no warranties whatsoever, including any warranty of merchantability, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification, or sample. Furthermore, information provided in this document is preliminary, and may be changed substantially prior to final release. This document is provided for informational purposes only.
Nokia Corporation disclaims all liability, including liability for infringement of any proprietary rights, relating to implementation of information presented in this document. Nokia Corporation does not warrant or represent that such use will not infringe such rights.
Nokia Corporation retains the right to make changes to this specification at any time, without notice.
License
A license is hereby granted to download and print a copy of this specification for personal use only. No other license to any other intellectual property rights is granted herein.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 3
Contents
1 Introduction................................................................................................................................................ 5 2 General electrical specifications ............................................................................................................ 6
2.1 General.........................................................................................................................................................6 2.2 Charger output capacitance..................................................................................................................6 2.3 Maximum voltage and current values...............................................................................................7 2.4 Maximum output ripple voltage .........................................................................................................8 2.5 Charger output conducted emissions ...............................................................................................9 2.6 Leakage current of AC chargers ...........................................................................................................9
3 Electrical specification for constant current type chargers ..........................................................10 3.1 Charging voltage — current window.............................................................................................10 3.2 U/I corner point......................................................................................................................................10 3.3 Current linearity.....................................................................................................................................10
4 Electrical specification for special chargers......................................................................................12 4.1 Charging voltage — current window.............................................................................................12 4.2 Charging voltage rise time.................................................................................................................12 4.3 Current linearity recommendation..................................................................................................12
5 Accessories connected between the charger and the mobile device........................................14 5.1 Accessory interfaces .............................................................................................................................14 5.2 Electrical specifications for accessories .........................................................................................14 5.3 Booting up the mobile device when connected to an accessory..........................................15 5.4 Charger identification..........................................................................................................................15
6 Charger identification method ............................................................................................................17 6.1 Charger voltage measurement .........................................................................................................17
7 Mechanical specification........................................................................................................................18 8 Terms and abbreviations.......................................................................................................................20 Appendix A: Artificial load.............................................................................................................................21 Evaluate this resource....................................................................................................................................22
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 4
Change history
June 16, 2005 Version 1.0 Initial document release
October 26, 2005 Version 1.1 Sections 2.4 and 4.1 updated
August 22, 2006 Version 1.2 Figure 13 updated
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 5
1 Introduction
This document specifies the electrical and mechanical charging interface between Nokia mobile devices and power-supply accessories, specifically chargers. It also defines the charger-identification process of these mobile devices. The specification is valid only for devices with a 2-mm charging interface.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 6
2 General electrical specifications
2.1 General
The interface supports the following two types of two-wire chargers:
1. Constant current chargers (standard charger)
A constant current type charger may have a wide output current range and the current may change with other parameters. The specifications for a constant current charger appear in Chapter 3, “Electrical specification for constant current type chargers.”
2. Special chargers
Special chargers take charging energy from a solar cell or hand-operated generator, for example. External charging conditions have a great impact on the charging current — the waveform of the charging current is unknown and charging can even be stopped. Battery charging time may vary considerably. Specifications for special chargers are described in Chapter 4, “Electrical specification for special chargers.”
2.2 Charger output capacitance
The capacitance in charger output causes charging current spikes when the charger's load changes. Low-capacitance values are recommended if possible. Maximum charger output filter capacitor size is 1000 µF if the charger VMAX-OUTPUT is less than 7 V. For output voltages of 7 V – 9.3 V, the maximum capacitance value decreases linearly so that for a 9.3 V charger, maximum output capacitance is 700 µF.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 7
6
7
8
99.3
Char
g er m
axim
u m o
utp u
tv o
ltage
Maximum recommendedoutput capacitance
500 700 1000 uF
V
5
10
4
Figure 1: Maximum charger output capacitance
2.3 Maximum voltage and current values
Maximum charger output overshoot 16 V
Maximum reverse voltage at charger output 1 V
Maximum time for constant current type charger to achieve steady state value (U and I) after load change
10 ms
Maximum duration of charging current overshoot peak value greater than 1.1 A
5 ms
Table 1: Limits for maximum voltage and settling time
* Limits are also valid for a damaged charger. * These voltage and current limits must be doubly insured; in other words, if the general charging voltage control system fails, there must be a backup limiter inside the charger.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 8
Current
1100 mA
Time
0 mA
Max. 5 ms
Nominal output current
Max. 10 ms
10%
Mobile device current limit
Figure 2: Maximum duration of charging current overshoot
2.4 Maximum output ripple voltage
The maximum acceptable output ripple voltage with maximum output current (constant current mode, 2.5 V < Uout < 5.5 V) is 300 mV (root mean square, RMS).
The maximum acceptable output peak-to-peak ripple voltage is separated to four frequency areas. A summary of ripple voltages with different frequencies over the full frequency area (0 – 1 MHz) is 800 mVP-P. Ripple voltage shall be measured using 0 – 6 kΩ resistive load.
Note: Charging voltage, including ripple, may never have peak values outside the U/I window for charger output.
Frequency Maximum voltage
0 - 20 Hz 200 mVp-p
20 Hz - 200 Hz 200 mVp-p
200 Hz - 20 kHz 200 mVp-p
20 kHz – 1 MHz 400 mVp-p
Table 2: Maximum ripple voltage by frequency
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 9
Frequency 200Hz - 20 kHzmax. VRIPPLE P-P 200 mV
Frequency 0 - 20 Hzmax. VRIPPLE P-P 200 mV All frequencies together
max. VRIPPLE P-P 800 mV
Figure 3: Maximum peak-to-peak ripple voltage
2.5 Charger output conducted emissions
Frequency range Maximum EMI disturbances
1 MHz – 80 MHz -40 dBm to -65 dBm linearly
80 MHz – 150 MHz -65 dBm
Table 3: Maximum conducted disturbances
The limits for conducted emissions from charger output are presented in Table 3 and Figure 4. The charger shall be connected to artificial load (Appendix A: Artificial load) during measurement.
LeveldBm
1 MHz 80 MHz 150 MHz
-30
-40
-50
-60
-70
-80
-90
Frequency
Figure 4: Maximum conducted emissions
2.6 Leakage current of AC chargers
Maximum leakage current from AC mains to the mobile device through the charger is 5 µA.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 10
3 Electrical specification for constant current type chargers
3.1 Charging voltage — current window
The minimum charging current is 300 mA. During charging, the current and voltage must fit within the charging window shown in Figure 5.
The only time that the charging voltage is allowed to go out of the charging current/voltage window is in a load change situation (see Section 2.3, “Maximum voltage and current values").
1
2
3
4
5
6
7
8
9
10
Volta
ge V
100 200 300 400 500 600 700 800 900 1000 1100 1200
Current mA
1.0 V
90950
9.3
5.7 5.54 V
.
Figure 5: Charging current/voltage window for constant current type chargers
3.2 U/I corner point
The U/I curve corner point when the constant voltage mode changes to the constant current mode is greater than 5.54 V if the current is more than 300 mA.
3.3 Current linearity
Maximum current fluctuation under stable temperature condition is 30 percent when the charger output voltage changes from 3.5 V to 5.0 V (for example, 500 mA - 30% = 350 mA) when input voltage and ambient temperature stay constant.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 11
1
2
3
4
5
6
7
8
Volta
ge V
100 200 300 400 500 600 700 800
Current mA
5.0 V
3.5 V
Figure 6: Current linearity specification
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 12
4 Electrical specification for special chargers
4.1 Charging voltage — current window
The minimum charging current is 90 mA. During charging, the current and the voltage must fit within the charging window shown in Figure 7. The only time that the charging voltage is allowed to go out of the charging current/voltage window is in a load change situation (see Section 2.3, "Maximum voltage and current values").
Products having high boot-up current consumption may be unable to boot-up with empty battery even if special charger, which provides only small current, is connected.
1
2
3
4
5
6
7
Volta
ge V
100 200 300 400 500 600 700 800 900 1000 1100 1200
1.0 V
90
5.2
950
1.6
4.65
Figure 7: Charging current/voltage window for special chargers
4.2 Charging voltage rise time
Special chargers don't have a time limit on how fast the charger must archive the steady state value (U and I) after load change. Charging will not start until the charger output voltage reaches 4.65 V. The charger must provide a minimum charging current according to Figure 8, even if the voltage is rising slowly.
4.3 Current linearity recommendation
Following current linearity recommendations yields the best results between chargers and Nokia mobile devices, thus good current linearity should be the goal when designing new chargers. However, adhering to the specification is not mandatory if doing so is impossible due to the structure of a specific charger.
Charging current linearity is divided into two parts, based on the charging current change frequency. For fICHAR < ½ Hz, the maximum allowed current slew rate is 0.28*ICHAR A/sec. For fICHAR > ½ Hz, the maximum charge current crest factor is < 1.14.
Crest factor = IPEAK / IRMS.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 13
800 100090 400
20
40
60
80
100
120
140
200 600ICHAR [mA]
Max
imum
pea
k cu
rren
t [m
A]
ICHAR o
ut o
f ran
ge
ICHAR o
ut o
f ran
ge
Allowed peakcurrent
Figure 8: Maximum allowed charging current peaks (crest factor) fICHAR > ½ Hz
200 600 800 1000
50
100
150
200
250
90 400
300
Max
imum
sle
w ra
te [m
A/se
c]
ICHAR [mA]
Allowed currentslew rate
ICHAR o
ut o
f ran
ge
I CHAR o
ut o
f ran
ge
.
Figure 9: Maximum allowed charging current slew rate fICHAR < ½ Hz
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 14
5 Accessories connected between the charger and the mobile device
5.1 Accessory interfaces
An accessory connected between the charger and the mobile device shares energy with that mobile device while taking energy for its own needs. The sharing policy varies based on the type of accessory and the operating conditions. The accessory must always provide an interface to the mobile device that meets this Nokia 2-mm DC Charging Interface Specification. The interface is indicated with dashed lines in Figure 10.
AccessoryCharger Mobile device
Voltage inVCHAR
GND
VCHAR
GND
Accessoryfunctionalities
Figure 10: Accessory/mobile device interface
5.2 Electrical specifications for accessories
Accessories connected between the charger and the mobile device and having direct contact with charging lines (for example, a desk stand), must not disturb the charging or charger identification.
Description Min. Typ. Max. Unit
Ground lead resistance with contacts 0 0.05 Ω
Positive lead resistance 0 0.2 0.40 Ω
Capacitance between charging lines 0 4.0 µF
Table 4: Electrical specification for accessory contacts
Figure 11 shows the U/I window that the accessory must provide to the mobile device.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 15
1
2
3
4
5
6
7
8
9
10
Volta
ge V
100 200 300 400 500 600 700 800 900 1000 1100 1200
Current mA
1.0 V
90
5.5
950
9.3
5.7
Minimum voltage atmobile device input
Minimum voltage atcharger output
5.54 V5.37 V
Figure 11: Charging current/voltage window for a mobile device
Even if the accessory is powered by a standard, constant current charger, it doesn't need to fulfill the current linearity specification for constant current type chargers (see Section 3.3, "Current linearity")
5.3 Booting up the mobile device when connected to an accessory
While the mobile device is booting up, the accessory connected between the charger and the device must not limit the charging current between the two. Also, it must be possible to boot up the mobile device when there is an accessory connected between the charger and the device and the device's battery is totally empty.
An accessory may have current consumption IMAX = 10mA as long as the charging voltage (VCHAR) is below 3.5 V.
5.4 Charger identification
An accessory connected between the charger and the mobile device must not prevent the device from identifying the charger type correctly. For example, if the accessory is connected to the charger, and the mobile device, which is powered on, is later connected to the accessory, the power consumption of the accessory may result in the wrong charger identification.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 16
The accessory must limit its power consumption (or use some other method) so that there is a minimum 5.5 V charging voltage available in the charging interface for the mobile device during the first 300 ms after the mobile device is connected to the accessory.
Some old charger types are detected with a 100/120 Hz output ripple voltage. The accessory must not prevent that detection. If the accessory input voltage is a rectified AC voltage, there must be a minimum 5.5 V average charging voltage available for the mobile device during 300 ms after the mobile device is connected to the accessory. The peak-to-peak value of the charging voltage must be more than 2000 mV.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 17
6 Charger identification method
6.1 Charger voltage measurement
When a charger is connected to the mobile device, the device's system will start the charger-recognition procedure by checking the charger voltage with 1 – 2 mA current. Identification is based on measured average voltage and waveform: 4.65 V – 5.20 V is identified as a special charger and 5.5 V – 9.3 V is identified as a standard charger.
ChargerVoltage
13
12
11
10
9
8
7
6
5
4
3
Special charger
Standardcharger
4.65 V to 5.20 V
5.5 V to 9.3 V
Charger voltage range
Over 9.3 VIllegal voltage
5.2 V - 5.5 V andunder 4.65 V
Illegal voltage Figure 12: Charger identification voltages
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 18
7 Mechanical specification
Figure 13: Mechanical specification for Nokia 2-mm charging plug (outmolding)
The charging voltage is connected to the center pin and the ground is connected to the outer surface of the plug.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 19
Figure 14: Mechanical specification for Nokia 2-mm charging plug
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 20
8 Terms and abbreviations
Term or abbreviation Meaning
AC Alternating current
CDN Coupling and decoupling network
Crest factor Current peak value/current RMS value
DC Direct current
EMI Electromagnetic interference
ESR Equivalent series resistance
Pop-Port System connector in Nokia mobile devices
PWM Pulse width modulation
RMS Root mean square
Slew rate (U or I) value change/changing time
U/I Voltage/Current
VCHAR Charging voltage
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 21
Appendix A: Artificial load
C1
DC jack
C2 R
In an artificial load circuit:
R value is selected so that charger output is 5.0 V.
C1 value is 4,400 µF – 6,000 µF, low ESR.
C2 value is 1 nF, low ESR.
Forum.Nokia.com
Nokia 2-mm DC Charging Interface Specification 22
Evaluate this resource
Please spare a moment to help us improve documentation quality and recognize the resources you find most valuable, by rating this resource.