ADuCM360/ADuCM361

Data Sheet

Rev. B | Page 18 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

2

3

P0.7/POR/SOUT

P0.6/IRQ2/SIN

P0.5/CTS/IRQ1

4

P0.4/RTS/ECLKO

5

P0.3/IRQ0/CS1

6

P0.2/MOSI1/SDA/SOUT

7

P0.1/SCLK1/SCL/SIN

TOP

VIEW

(Not to Scale)

ADuCM360/

ADuCM361

25

AIN4/IEXC

26

AIN3

27

AIN2

28

AIN1

29

AIN0

30

DVDD_REG

31

IOVDD

32

XTALI

33

XTALO

34

P2.2/BM

35

P2.1/SDA/UARTDCD

NOTES

1. THE LFCSP HAS AN EXPOSED PAD THAT MUST BE SOLDERED TO A METAL PLATE

ON THE PCB FOR MECHANICAL REASONS AND TO DGND.

36

RESET

8

P0.0/MISO1

9

AIN11/VBIAS1

10

AIN10

11

AIN9/DACBUFF+

12

AIN8/EXTREF2IN–

Figure 8. Pin Configuration

Table 16. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

RESET

Reset Pin, Active Low Input. An internal pull-up is provided.

2

P2.1/SDA/UARTDCD

3

P2.2/BM

General-Purpose Input/Output P2.2/Boot Mode Input Select Pin. When this pin is held low

during and for a short time after any reset sequence, the part enters UART download mode.

4

XTALO

External Crystal Oscillator Output Pin. Optional 32.768 kHz source for real-time clock.

5

XTALI

External Crystal Oscillator Input Pin. Optional 32.768 kHz source for real-time clock.

6

IOVDD

Digital System Supply Pin. This pin must be connected to DGND via a 0.1 µF capacitor.

7

DVDD_REG

This pin must be connected to DGND via a 470 nF capacitor and to Pin 18, AVDD_REG.

8

AIN0

ADC Analog Input 0. This pin can be configured as a positive or negative input to either ADC

in differential or single-ended mode.

9

AIN1

ADC Analog Input 1. This pin can be configured as a positive or negative input to either ADC

in differential or single-ended mode.

10

AIN2

ADC Analog Input 2. This pin can be configured as a positive or negative input to either ADC

in differential or single-ended mode.

11

AIN3

ADC Analog Input 3. This pin can be configured as a positive or negative input to either ADC

in differential or single-ended mode.

12

AIN4/IEXC

ADC Analog Input 4/Excitation Current Source. This pin can be configured as a positive or

negative input to either ADC in differential or single-ended mode (AIN4). This pin can also be

configured as the output pin for Excitation Current Source 0 or Excitation Current Source 1 (IEXC).

13

GND_SW

Sensor Power Switch to Analog Ground Reference.