RT1025

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DS1025-01

July

2022

4

Pin No.

Pin Name

Type

Pin Function

C3, C5, D2

GND_D

G

Digital ground. Connected to common board ground.

D1, G1, G2

GND_HV

G

High voltage driver ground. Connected to common board ground.

E1

VLX

AI

PPG circuit bias

E2

SPI_MOSI

DIO

(1) SPI mode : SPI serial in master out.

(2) I2C mode : I2C slave address (7-bit mode)

a. H = 7-bit slave address (hex)) = 37 and 27

b. L = 7-bit slave address (hex)) = 33 and 23

E7

VRLD

AO

RLD output. (leave floating at 2E mode)

F1

NC

Leave floating.

F7

INN_ECG

AI

ECG IA negative input.

G3, G6, H3

GND_A

G

Analog ground. Connected to common board ground.

G4

VCM

AI

PPG input common mode voltage. (leave floating)

G5

INP_PPG

AI

PPG receiver input pin. Connected to photodiode anode.

G7

INP_ECG

AI

ECG IA positive input.

H1

TX2

AO

LED driver output. Connected to LED.

H2

TX1

AO

LED driver output. Connected to LED.

H4

VBG

AIO

Bandgap output voltage. 1

µF decoupling capacitor to ground.

H6

INN_PPG

AI

PPG receiver input pin. Connected to photodiode cathode.

H7

AVDD28

P

Analog supply. 2.2

µF decoupling capacitor to ground.

Pin type :

AI : Analog Input, AO : Analog Input, AIO : Analog I/O, DI : Digital Input, DO : Digital Output, DIO : Digital I/O,

P : Power, G : GND