MAX32666FTHR Application Platform-Evaluates: MAX32666 · 2020. 6. 29. · Capacitor 16pF 50V 5% C0G/NP0 0402 2 D1, D2 Schottky Diode 0V/0.5A SOD-123 1 D3 LED yellow 0603 1 D4 LED

Evaluates: MAX32666MAX32666FTHR Application Platform

General DescriptionThe MAX32666FTHR board is a rapid development platform to help engineers quickly implement battery opti-mized Bluetooth® 5 solutions with the MAX32666 Arm® Cortex®-M4 processor with FPU. The board also includes the MAX1555 1-Cell Li+ battery charger for battery man-agement. The form factor is a small 0.9in by 2.0in dual-row header footprint that is compatible with breadboards and off-the-shelf peripheral expansion boards. The board also includes a variety of peripherals, such as a micro SD card connector, 6-axis accelerometer/gyro, RGB indica-tor LED, and pushbutton. This platform provides power-optimized flexible for quick proof-of-concepts and early software development to enhance time to market.

Ordering Information appears at end of data sheet.

Features ● MAX32666 Microcontroller

• Dual Arm Cortex-M4F, 96MHz• 1MB Flash Memory• 560KB SRAM• 3 x 16KB Cache• Bluetooth 5 Low Energy Radio• High-Speed USB 2.0• Three QSPI Master/Slave• Three I2C Master/Slave• Three UARTS• SD/SDIO 3.0 • 1-Wire® Master• 48 GPIO• 8 Input, 10-Bit ADC

● MAX1555 1-Cell Li+ Battery Charger• Charge from USB• On-Chip Thermal Limiting• Charge Status Indicator

● Expansion Connections• Breadboard Compatible Headers• 10-Pin Cortex Debug Header• Micro USB Connector• Micro SD Card Connector

● Integrated Peripherals• RGB Indicator LED• User Pushbutton• 6-Axis Accelerometer/Gyro• Bluetooth Surface Mount Antenna

● SWD/MAXDAP Debug Interface• Drag-and-Drop Programming• SWD Debugger• Virtual UART Console

Bluetooth SIG registered trademark.Arm and Cortex are registered trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere.1-Wire is a registered trademark of Maxim Integrated Products, Inc.

319-100525; Rev 0; 3/20

Click here for production status of specific part numbers.

https://www.maximintegrated.com/en/storefront/storefront.html

Maxim Integrated │ 2www.maximintegrated.com


Quick StartApply power to the MAX32666FTHR using the USB cable. The blue LED (D4) begins to blink indicating that the board is transmitting a BLE beacon. Observe the beacon using

any BLE capable phone or tablet. The beacon appears as MAX32666FTHR Beacon.The source code for the beacon firmware can be found in the Maxim Low Power Arm Micro Toolchain.

Figure 1. MAX32666FTHR Pinout Diagram



Figure 2. MAX32666FTHR Top Side Components



Figure 3. MAX32666FTHR Bottom Side Components



Battery ChargerThe MAX1555 charges a single-cell Li+ battery from a USB source. When the MAX1555 thermal limits are reached, the charger does not shut down, but simply reduces charging current by 17mA/°C above a die tem-perature of +110°C. The USB charge current is set to 100mA (max). This allows charging from both powered

and unpowered USB hubs with no port communication required. Refer to the MAX1551/MAX1555 data sheet and the data sheet for your battery to ensure compatibility.

Expansion HeadersNote: All port pins labeled Pn_n are capable of GPIO or PWM with timer or pulse train engine.

Table 1. JH3 Pinout

Table 2. JH4 Pinout

PIN NAME DESCRIPTION1 GND Ground2 P0_9 UART0 Tx3 P0_10 UART0 Rx4 P0_26 QSPI2 MISO5 P0_25 QSPI2 MOSI6 P0_27 QSPI2 SCK7 AIN_5 ADC Analog Input. Alternatively, AIN2N or P0_218 AIN_4 ADC Analog Input. Alternatively, AIN2P or P0_209 AIN_3 ADC Analog Input. Alternatively, AIN1N or P0_1910 AIN_2 ADC Analog Input. Alternatively, AIN1P or P0_1811 AIN_1 ADC Analog Input. Alternatively, AIN0N or P0_1712 AIN_0 ADC Analog Input. Alternatively, AIN0P or P0_1613 GND Ground14 NC No Connection15 3V3 3.3V Output. Typically used to provide 3.3V to peripherals connected to the expansion headers16 RSTN Master Reset Signal

PIN NAME DESCRIPTION

1 SYS SYS switched connection to the Battery. This is the primary system power supply and automatically switches between the battery voltage and the USB supply when available.2 PWREN Power Enable. This is connected to the ON pin of the MAX4995 LDO. It turns off the LDO if shorted to GND.

3 VBUSUSB VBUS Signal. This can be used as a 5V supply when connected to USB. This pin can also be used as an input to power the board, but this should only be done when not using the USB connector since there is no circuitry to prevent current from flowing back into the USB connector.

4 P0_12 1-Wire master signal5 P0_3 SPIXF SCK6 P0_5 SPIXF SDIO37 P0_4 SPIXF SDIO28 P0_2 SPIXF SDIO1/MISO9 P0_1 SPIXF SDIO0/MOSI10 P0_0 SPIXF SS011 P0_6 I2CM0 SCL. Pulled to MAX32666 VDDIOH, connected to BMI160.12 P0_7 I2CM0 SDA. Pulled to MAX32666 VDDIOH, connected to BMI160.



#Denotes RoHS compliance.

PART TYPEMAX32666FTHR# Application Platform

QTY SCHEMATIC REFERENCE DESCRIPTION

1 U1 Arm Cortex-M4F, MAX326661 ANT1 Antenna 2.4GHz chip

5 C1, C10, C11, C12, C13 Capacitor 22µF 6.3V 20% X5R 0603

17

C2, C3, C4, C5, C6, C7,

C9, C14, C15, C16, C17, C18, C20, C24, C26,

C27, C28

Capacitor 1µF 6.3V X5R 0402

1 C8 Capacitor 4700pF 16V 10% X7R 0201

7C19, C21, C22, C23, C25, C32,

C33

Capacitor 0.1µF 6.3V 10% X5R 0201

2 C29, C34 Capacitor 1.5pF 50V ±0.1pF C0G/NP0 0402

2 C30, C31 Capacitor 16pF 50V 5% C0G/NP0 0402

2 D1, D2 Schottky Diode 0V/0.5A SOD-1231 D3 LED yellow 06031 D4 LED RGB Clear 04041 J1 Header vertical 2 position 1.27mm1 J2 Connector micro USB B right angle

1 J3 Connector microSD PUSH-PULL right angle

1 JH1 Header 2 position 2mm right angle1 JH2 Header 10 position dual 0.05mm1 JH3 Header 0.100 16 position1 JH4 Header 0.100 12 position

QTY SCHEMATIC REFERENCE DESCRIPTION

1 L1 Ferrite bead 120 0805 1LN1 L2 Inductor 2.2µH 1A 150m 08051 Q1 MOSFET P-CH 20V 0.2A1 R1 Resistor 93.1kΩ 1% 1/10W 0402

6 R2, R14, R20, R21, R23, R24 Resistor 100kΩ 1% 1/10W 0402

1 R3 Resistor 215kΩ 1% 1/10W 04021 R4 Resistor 330kΩ 1% 1/10W 0402

7 R5, R6, R7, R8, R9, R10, R11 Resistor 10kΩ 1% 1/16W 0402

1 R12 Resistor 10kΩ 1% 1/10W 04022 R13, R16 Resistor 2.7kΩ 1% 1/10W 04021 R15 Resistor 499kΩ 1% 1/10W 04021 R17 Resistor 1.4kΩ 1% 1/10W 04022 R18, R19 Resistor 4.7kΩ 1/10W 1% 04021 R22 Resistor 1kΩ 1/10W 1% 04021 R25 Resistor 0.0 1/10W 0402

1 U2 2 Channel ESD protection, MAX13202EALT

1 U3 Current limit switch, MAX4995AAUT

1 U4 1-Cell Li+ battery charger, MAX1555EZK

2 U5, U6 Linear regulator 3.3V 150mA, MAX8841ELT33

1 U7 1-Wire EEPROM 2Kib, DS28EL22Q1 U8 Inertial measurement unit, BMI1601 Y1 Crystal 32.768kHz 6.0pF1 Y2 Crystal 32.00 MHz 12pF

Ordering Information

Component List



MAX32666FTHR Application Platform Schematic90

ohm

diff

eren

tial t

race

s

VREG

O_D

VTXO

UTVR

XOUT

VREG

O_A

VREG

O_B

VREG

O_C

VREG

O_D

VREG

O_A

VREG

O_A

LDO

_3V3

VREG

O_C

VREG

O_B

VRXO

UT

VTXO

UTVR

XOUT

VRXO

UTVR

XOUT

VDD

B

VDD

B

LDO

_3V3

LDO

_3V3

LDO

_3V3

LDO

_3V3

LDO

_3V3

VREG

O_A

VREG

O_A

VREG

O_A

VREG

O_A

VREG

O_A

VREG

O_A

VREG

O_A

LDO

_3V3

VBU

S

VBU

S

SWIT

CH

ED_P

WR

SWIT

CH

ED_P

WR

LDO

_3V3

LDO

_3V3

DM

DP

DMDP

P1_2

P1_4

P1_5

P1_0

P1_1

P1_3

P1_7

P1_2

P1_4

P1_5

P1_0

P1_1

P1_3

P1_7

P0_1

2

RST

N

SWD

IOSW

CLK

SWD

IOSW

CLK

P1_1

3P1

_12

RST

N

P0_0

P0_1

P0_1

P0_2

P0_2

P0_3

P0_3

P0_4

P0_5

P0_4

P0_5

P0_6

P0_7

P0_6

P0_7

P1_1

1

RST

N

P1_1

2P1

_13

P1_1

1

P0_1

6P0

_17

P0_1

8P0

_19

P0_1

6P0

_17

P0_1

8P0

_19

P0_2

9P0

_30

P0_3

1

P0_2

9

P0_3

0

P0_3

1

P0_1

2

P0_7

P0_6

P0_2

0P0

_21

P0_2

0P0

_21

P1_1

0

P1_1

0

PWR

_EN

ABLE

PWR

_EN

ABLE

RST

N

P0_0

P0_1

0P0

_9

P0_1

0P0

_9

P0_1

2P0

_13

P0_1

3

P0_2

5P0

_26

P0_2

7

P0_2

5P0

_26

P0_2

7

R1

93.1

K04

02

C24

1uF

0402

MAX

3266

6_12

1P_B

GA

U1

121P

BG

A

P0.0

/SPI

XF_S

S0/U

ART2

_CTS

/TM

R0

K6

P0.1

/SPI

XF_M

OSI

/SD

IO0/

UAR

T2_T

X/TM

R1

K7

P0.2

/SPI

XF_M

ISO

/SD

IO1/

UAR

T2_R

X/TM

R2

J10

P0.3

/SPI

XF_S

CK/

UAR

T2_R

TS/T

MR

3J9

P0.4

/SPI

XF_S

DIO

2/O

WM

_IO

/TM

R4

K9

P0.5

/SPI

XF_S

DIO

3/O

WM

_PE/

TMR

5L9

P0.6

/I2C

0_SC

L/SW

DIO

2/TM

R0

L8

P0.7

/I2C

0_SD

A/SW

CLK

2/TM

R1

K8

P0.8

/SPI

XR_S

S0/Q

SPI0

_SS0

/UAR

T0_C

TS/T

MR

2E7

P0.9

/SPI

XR_M

OSI

/SD

IO0/

QSP

I0_M

OSI

/SD

IO0/

UAR

T0_T

X/TM

R3

D7

P0.1

0/SP

IXR

_MIS

O/S

DIO

1/Q

SPI0

_MIS

O/S

DIO

1/U

ART0

_RX/

TMR

4G

6

P0.1

1/SP

IXR

_SC

K/Q

SPI0

_SC

K/U

ART0

_RTS

/TM

R5

F6

P0.1

2/SP

IXR

_SD

IO2/

QSP

I0_S

DIO

2/O

WM

_IO

/TM

R0

G5

P0.1

3/SP

IXR

_SD

IO3/

QSP

I0_S

DIO

3/O

WM

_PE/

TMR

1H

5

P0.1

4/I2

C1_

SCL/

QSP

I0_S

S1/B

LE_A

NT_

CTR

L/TM

R2

F5

P0.1

5/I2

C1_

SDA/

QSP

I0_S

S2/B

LE_A

NT_

CTR

L/TM

R3

D6

P0.1

6/AI

N0/

AIN

0P/Q

SPI1

_SS0

/OW

M_I

O/T

MR

4K1

1

P0.1

7/AI

N1/

AIN

0N/Q

SPI1

_MO

SI/S

DIO

0/O

WM

_PE/

TMR

5H

9

P0.1

8/AI

N2/

AIN

1P/Q

SPI1

_MIS

O/S

DIO

1/TM

R0/

PDO

WN

G9

P0.1

9/AI

N3/

AIN

1N/Q

SPI1

_SC

K/TM

R1/

SQW

OU

TJ1

1

P0.2

0/AI

N4/

AIN

2P/Q

SPI1

_SD

IO2/

UAR

T1_R

X/TM

R2

H10

P0.2

1/AI

N5/

AIN

2N/Q

SPI1

_SD

IO3/

UAR

T1_T

X/TM

R3

E8

P0.2

2/AI

N6/

AIN

3P/Q

SPI1

_SS1

/UAR

T1_C

TS/T

MR

4E9

P0.2

3/AI

N7/

AIN

3N/Q

SPI1

_SS2

/UAR

T1_R

TS/T

MR

5D

8

P0.2

4/PC

M_L

RC

LK/Q

SPI2

_SS0

/OW

M_I

O/T

MR

0G

8

P0.2

5/PC

M_D

OU

T/Q

SPI2

_MO

SI/S

DIO

0/O

WM

_PE/

TMR

1H

8

P0.2

6/PC

M_D

IN/Q

SPI2

_MIS

O/S

DIO

1/TM

R2/

PDO

WN

J8

P0.2

7/PC

M_B

CLK

/QSP

I2_S

CK/

TMR

3/SQ

WO

UT

H7

P0.2

8/PD

M_D

ATA2

/QSP

I2_S

DIO

2/U

ART2

_RX/

TMR

4J7

P0.2

9/PD

M_D

ATA3

/QSP

I2_S

DIO

3/U

ART2

_TX/

TMR

5H

6

P0.3

0/PD

M_R

X_C

LK/Q

SPI2

_SS1

/UAR

T2_C

TS/T

MR

0J6

P0.3

1/PD

M_M

CLK

/QSP

I2_S

S2/U

ART2

_RTS

/TM

R1

K5

P1.1

/SD

HC

_CM

D/S

DM

A_TD

O/P

T1K3

P1.2

/SD

HC

_DAT

0/SD

MA_

TDI/P

T2L4

P1.3

/SD

HC

_CLK

/SD

MA_

TCK/

PT3

K4

P1.4

/SD

HC

_DAT

1/U

ART0

_RX/

PT4

J5

P1.5

/SD

HC

_DAT

2/U

ART0

_TX/

PT5

J4

P1.6

/SD

HC

_WP/

UAR

T0_C

TS/P

T6J3

P1.7

/SD

HC

_CD

N/U

ART0

_RTS

/PT7

J2

P1.8

/QSP

I0_S

S0/P

T8H

4

P1.9

/QSP

I0_M

OSI

/PT9

H1

P1.1

0/Q

SPI0

_MIS

O/P

T10

H3

P1.1

1/Q

SPI0

_SC

K/PT

11H

2

P1.1

2/Q

SPI0

_SD

IO2/

UAR

T1_R

X/PT

12E5

P1.1

3/Q

SPI0

_SD

IO3/

UAR

T1_T

X/PT

13E6

P1.1

4/I2

C2_

SCL/

UAR

T1_C

TS/P

T14/

JTAG

TD

IG

4

P1.1

5/I2

C2_

SDA/

UAR

T1_R

TS/P

T15/

JTAG

TD

OD

5

DM

F11

DP

G11

RST

NC

5

SWD

IOC

6

SWC

LKG

7

32KI

NF1

32KO

UT

F2

HFX

INA4

HFX

OU

TB4

P1.0

/SD

HC

_DAT

3/SD

MA_

TMS/

PT0

K2

VDD

BG

10

VSSB

F10

VSS

F8

VSS

F9

VSSA

B7VD

DA

C8

VDD

IOK1

0

VDD

IOL1

1

VDD

IOH

L10

VDD

IOH

D9

VCO

REA

L6VC

OR

EAD

10

VCO

REB

L7

VCO

REB

D11

VREG

IC

11

VSSP

WR

B10

LXA

B11

LXB

A10

VBST

C10

VREG

O_A

B9

VREG

0_B

A9

VREG

0_C

A8

VREG

0_D

B8

VSSA

_BT5

B3

VDD

IOC

9

VSS

F7

VSS

G3

VSS

L5

VSS

A7

VDD

IOL3

VSS

G2

VDD

IOH

L2

VSS

G1

VCO

REA

K1

VCO

REB

J1

VRXI

NA5

VRXO

UT

B5

VTXI

NA6

VTXO

UT

B6

VDD

_BT1

D3

VDD

_BT2

C3

VDD

_BT3

E1

VDD

_BT4

D1

VDD

_BT5

A3

VSSA

_BT0

D4

VSSA

_BT1

C2

VSSA

_BT2

C4

VSSA

_BT3

E2

VSSA

_BT4

C1

ANT

B2

VSSP

WR

A11

VSS

E10

VSS

E11

VSS

H11

VSSA

_BT1

B1

VDD

_BT1

D2

VSSA

_BT0

E3

VSSA

_BT0

E4

VREG

IC

7

D.N

.C._

F3F3

D.N

.C._

F4F4

GN

DA1

ANT_

THR

UA2

N.C

._L1

L1

Y232

MH

Z1 2

3 4

R6

10K

0402

SW1

PB1

12

R16

2.7K

0402

U2

MAX

1320

2EAL

T+T

6P 1

x1.5

uD

FN

VCC

1

NC

_12

IO1

3IO

24

NC

_25

GN

D6

J3 0475

71-0

001

0475

71-0

001

DAT

2P1

CD

/DAT

3P2

CM

DP3

VDD

P4C

LKP5

VSS

P6

DAT

0P7

DAT

1P8

GN

DG

1

GN

DG

2

GN

DG

3

POL

G4

DET

G5

R10

10K

0402

C1

22uF

0603

L1 BLM

21AG

121S

N1D

0805

C6

1uF

0402

JH3

16P

1x16

1x16

(0.1

" LS)

11

22

33

44

55

66

77

88

99

1010

1111

1212

1313

1414

1515

1616

C18

1uF

0402

C3

1uF

0402

R5

10K

0402

C4

1uF

0402

C23

100n

F02

01

SW2

RESE

T1

2JH

412

P 1x

12

1x12

(0.1

" LS)

11

22

33

44

55

66

77

88

99

1010

1111

1212

R17

1.4K

0402

U7

DS2

8EL2

2Q+T

6P 3

X3 T

DFNNC

11

IO2

GN

D3

NC

44

NC

55

NC

66

EP7

R15

499

0402

C11

22uF

0603

R22

1K 0402

C17

1uF

0402

C14

1uF

0402

J1 1x2

(0.0

5" L

S)

11

22

SML-

LX04

04SI

UPG

USB

D4

SML-

LX04

04SI

UPG

USB

CO

M A

1R

ED K

2

BLU

E K

3

GR

EEN

K4

C19

100n

F02

01

C13

22uF

0603

G

D S

Q1

DM

P210

DU

FB4-

7

123

R21

100K

0402

C21

100n

F02

01

C29

0402

R2

100K

0402

C27

1uF

0402

J4 DN

I10

05(0

402)

1 2

C25

100n

F02

01R

1410

0K04

02

C15

1uF

0402

C16

1uF

0402

Y1 32.7

68kH

z1

2

R12

10 0402

C7

1uF

0402

R7

10K

0402

L2 2.2u

H08

05

U3

MAX

4995

AAU

T+T

SOT-

23 6

P

OU

T1

GN

D2

SETI

3

ON

4

IN5

FLAG

6

R8

10K

0402

D2

MBR

0530

SOD

-123

R9

10K

0402

R11

10K

0402

C2

1uF

0402

JH1

2PO

S 2M

M R

A1

+2

-

C20

1uF

0402

R3

215K

0402

C32

100n

F02

01

U6

MAX

8841

ELT3

3+T

6P 1

.5X1

.0 U

DFNN

C4

4SH

DN

3

GN

D2

IN1

OU

T6

NC

55

C5

1uF

0402

C26

1uF

0402

C28

1uF

0402

R20

100K

0402

ANT1

2450

AT18

D01

00E

3.2x

1.6

SMT

IN1/

GN

D1

IN2/

GN

D4

GN

D3

GN

D2

C10

22uF

0603

U8

BMI1

60

14P

LGA

(2.5

x3)

SDO

1

ASD

X2

ASC

X3

INT1

4

VDD

IO5

GN

DIO

6

GN

D7

VDD

8

INT2

9

OC

SB10

OSD

O11

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14

C34

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C22

100n

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01

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0 0402

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C12

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ISO

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QSP

I2_M

OSI

QSP

I2_M

ISO

QSP

I2_S

CK

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Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2020 Maxim Integrated Products, Inc. │ 8


REVISIONNUMBER

REVISIONDATE DESCRIPTION

PAGESCHANGED

0 3/20 Initial release —

Revision History

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Documents

MAX32666FTHR Application Platform-Evaluates: MAX32666 · 2020. 6. 29. · Capacitor 16pF 50V 5% C0G/NP0 0402 2 D1, D2 Schottky Diode 0V/0.5A SOD-123 1 D3 LED yellow 0603 1 D4 LED