 2015 Microchip Technology Inc.

DS70005224A-page 5

RN1723

TABLE 1-1:

PIN DESCRIPTIONS

Pin #

Name

Type

Description

1

GND

P

Ground reference

2

ISP_TX

DO

In-system programming transmit

3

ISP_RX

DI

In-system programming receive

4

GPIO9/SD_CLK/SCLK

DIO

5

GPIO8/SD_D3/SS

DIO

6

GPIO7/SD_D2

DIO

7

GPIO6/SD_D1/INT

DIO

8

GPIO5/SD_D0/MISO

DIO

9

GPIO4/SD_CMD/MOSI

DIO

10

VDD

P

Positive supply

11

GPIO3

DIO

12

GPIO2

DIO

13

GPIO1

DIO

14

GND

P

Ground reference

15

SPI_CS

DO

SPI master chip select to internal Flash memory chip select (do not

connect)

16

SPI_MISO

DI

SPI master data Input to internal Flash memory data output (do not

connect)

17

SPI_SCK

DO

SPI master clock to internal Flash memory clock (do not connect)

18

SPI_MOSI

DO

SPI master data output to internal Flash memory data input (do not

connect)

19

FLASH_POWER

P

Internal Flash memory power

20

GND

P

Ground reference

21

GND

P

Ground reference

22

GND

P

Ground reference

23

GND

P

Ground reference

24

ANT

AIO

RF antenna. 50

 impedance

25

GND

P

Ground reference

26

GND

P

Ground reference

27

GND

P

Ground reference

28

GND

P

Ground reference

29

SENSOR0

AI

30

SENSOR1

AI

31

SENSOR2

AI

32

SENSOR3

AI

33

SENSOR_POWER

P

Sensor power

34

VDD

P

Positive supply

35

SENSOR4

AI

36

SENSOR5

AI

Legend: A = Analog;

D = Digital;

I = Input;

O = Output

P = Power

Note 1:

Refer to Section 5.0 “Electrical Characteristics” for the GPIO voltage and current limitations.

2:

Digital input/output (bidirectional) 8 mA drive, ~83 K internal pull-down. 3.3V tolerant.

Reset State: Pull-down.

3:

Digital input/output (bidirectional) 24 mA drive, no internal pull-down. 3.3V tolerant.

Reset State: High-Z (do not allow to float).

4:

Analog input. 0-400 mV (do not exceed 1.2V DC).