Microchip Technology DM160218 Data Sheet

 2012-2013 Microchip Technology Inc.

DS40001667C-page 3

V

CAPS

1

P

—

External filter capacitor (10 µF) connection for internal STEP-UP 
converter (optional).

V

INDS

2

P

—

External inductor (4.7 µH) + Schottky diode connection for internal 
STEP-UP converter usage (optional).

V

SS2

3

P

—

Ground reference for the STEP-UP converter.

RX0

4

I

Analog

Analog input channels: Receive electrode connection.

RX1

5

I

Analog

RX2

6

I

Analog

RX3

7

I

Analog

RX4

8

I

Analog

V

CAPA

9

P

—

External filter capacitor (4.7 µF) connection for internal analog 
voltage regulator (3V).

V

SS3

10

P

—

Common ground reference for analog and digital domain.

V

CAPD

11

P

—

External filter capacitor (4.7 µF) connection for internal digital 
voltage regulator (1.8V).

EIO0

12

I/O

ST

Extended IO0 (EIO0)/Transfer Status (TS). TS line requires 
external 10 k

pull-up

EIO1

13

I/O

ST

Extended IO1 (EIO1)/Interface Selection Pin 1 (IS1).

EIO2

14

I/O

ST

Extended IO2 (EIO2)/IRQ0.

IS2

15

I

ST

Interface Selection Pin 2 (IS2).

NC

16

—

—

Reserved: do not connect.

NC

17

—

—

Reserved: do not connect.

NC

18

—

—

Reserved: do not connect.

EIO3

19

I/O

ST

Extended IO3 (EIO3)/IRQ1/SYNC.

EIO4/SI0

20

I/O

ST

Extended IO4 (EIO4)/Serial Interface 0 (SI0): I

2

C™_SDA0/

SPI_MISO. When I

2

C™ is used, this line requires an external 1.8 

k

pull-up.

EIO5/SI1

21

I/O

ST

Extended IO5 (EIO5)/Serial Interface 1 (SI1): I

2

C™_SCL0/SPI_-

MOSI. When I

2

C™ is used, this line requires an external 1.8 k



pull-up.

EIO6/SI2

22

I/O

ST

Extended IO6 (EIO6)/Serial Interface 2 (SI2): I

2

C™_SDA1/

SPI_CS. When I

2

C™ is used, this line requires an external 1.8 k



pull-up.

EIO7/SI3

23

I/O

ST

Extended IO7 (EIO7)/Serial Interface 3 (SI3): I

2

C™_SCL1/SPI_S-

CLK. When I

2

C™ is used, this line requires an external 1.8 k



pull-up.

MCLR

24

I/P

ST

Master Clear (Reset) input. This pin is an active-low Reset to the 
device. It requires external 10 k

pull-up.

T

XD

25

O

Analog

Transmit electrode connection.

NC

26

—

—

Reserved: do not connect.

V

SS1

27

P

—

Common ground reference for analog and digital domains.

V

DD

28

P

—

Positive supply for peripheral logic and I/O pins.                                
It requires an external filtering capacitor (100 nF).

EXP

29

P

—

Exposed pad. It should be connected to Ground.

Legend: P = Power; ST = Schmitt Trigger input with CMOS levels; O = Output; I = Input; 

— = N/A