Analog Integrated Circuit Device Data

4

Freescale Semiconductor

33975

TERMINAL CONNECTIONS

TERMINAL CONNECTIONS

Figure 3. 33975 Terminal Connections

Table 2. Terminal Definitions

A functional description of each terminal can be found in the Functional Terminal Description section on page 11.

Terminal

Terminal

Name

Formal Name

Description

1

GND

Ground

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

2

SI

SPI Slave In

SPI control data input terminal from MCU to 33975.

3

SCLK

Serial Clock

SPI control clock input terminal.

4

CS

Chip Select

SPI control chip select input terminal from MCU to 33975. Logic [0] allows data

to be transferred in.

5–8

25–28

SPn

Programmable Switches 0–3

Programmable Switches 4–7

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

9–15,

18–24

SGn

Switch-to-Ground Inputs 0–6

Switch-to-Ground Inputs 13–7

Switch-to-ground input terminals.

16

VPWR

Battery Input

Battery supply input terminal. This terminal requires external reverse battery

protection.

17

WAKE

Wake-Up

Open drain wake-up output is designed to control a power supply enable

terminal.

29

INT

Interrupt

Open-drain output to MCU is 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 33975 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