Analog Integrated Circuit Device Data

4

Freescale Semiconductor

33972

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 33972 Pin Connections

Table 2. 33972 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.

Pin Number

Pin Name

Formal Name

Definition

1

GND

Ground

Ground for logic, analog, and switch to battery inputs.

2

SI

SPI Slave In

SPI control data input pin from MCU to 33972.

3

SCLK

Serial Clock

SPI control clock input pin.

4

CS

Chip Select

SPI control chip select input pin from MCU to 33972. Logic [0} allows data to be

transferred in.

5–8

25–28

SP0–3

SP4–7

Programmable Switches

0–7

Programmable switch-to-battery or switch-to-ground input pins.

9–15,

18–24

SG0–6,

SG13–7

Switch-to-Ground Inputs

0–13

Switch-to-ground input pins.

16

VPWR

Battery Input

Battery supply input pin. Pin requires external reverse battery protection.

17

WAKE

Wake-Up

Open drain wake-up output. Designed to control a power supply enable pin.

29

INT

Interrupt

Open-drain output to MCU. Used to indicate input switch change of state.

30

AMUX

Analog Multiplex Output

Analog multiplex output.

31

VDD

Voltage Drain Supply

3.3/5.0 V supply. Sets SPI communication level for SO driver.

32

SO

SPI Slave Out

Provides digital data from 33972 to MCU.

SO

1

SP7

SP6

SP5

SP4

SG7

SG8

SG9

SG10

SG11

SG13

WAKE

SG12

INT

VDD

AMUX

GND

SP0

SP1

SP2

SP3

SG0

SG1

SG2

SG3

SG4

SG6

VPWR

SG5

CS

SI

SCLK

8

9

10

11

12

13

14

15

16

3

4

5

6

7

2

32

25

24

23

22

21

20

19

18

17

30

29

28

27

26

31