Pin function description

STA1050

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Pin function description

Table 1.

Pin List- LQFP128

N°

Name

Description

Pin Type

1

DRD15/FLASH_D7

SDRAM Data 15 or FLASH Data 7

bidir, 3.3V, 2mA

2

DRD0/GPC0

SDRAM Data 0 or ST7 GPIO PC0

bidir, 3.3V, 2mA

3

VDDPAD5

3.3V

Vdd

4

VDDPAD1

3.3V

Vdd

5

RESETN

Hardware reset input (pull-up)

in, 3.3V

6

TESTEN

Test enable signal (Active low)

in, 3.3V

7

I2C_SDA/GPB5

I2C I/F data or ST7 GPIO PB5

i2c dedicated

8

I2C_SCL/GPB4

I2C I/F clock or ST7 GPIO PB4

i2c dedicated

9

I2C_CRQ

I2C CRQ lime or ST7 GPIO PA0

i2c dedicated

10

#nc

to be connected to ground on PCB

11

#nc

to be connected to ground on PCB

12

PLL_VSS18P

PLL Digital&Analog ground

Vss

13

PLL_VDDA33P

PLL 3.3 Analog power supply

Vdd

14

#nc

to be connected to ground on PCB

15

PLL_XTI

Crystal input

analog in

16

PLL_XTO

Crystal output

analog out

17

#nc

to be connected to ground on PCB

18

PLL_VDDA18P

PLL 1.8V Analog power supply

Vdd

19

PLL_VDD18P

PLL 1.8V Digital power supply

Vdd

20

FE_VSSA33S

Ground for servo channels

Vss

21

FE_A

OPU “A” input

analog in

22

FE_C

OPU “C” input

analog in

23

FE_B

OPU “B” input

analog in

24

FE_D

OPU “D” input

analog in

25

FE_E

OPU “E” input

analog in

26

FE_F

OPU “F” input

analog in

27

FE_VDDA33S

3.3V Analog for servo channels/ 3.3V for AFE pad ring

(decoupling cap to Vssa)

Vdd

28

FE_VDDPAD1

3.3V for AFE pad ring

Vdd

29

FE_ADCIN1

General purpose ADC input 1

analog in

30

FE_ADCIN2

General purpose ADC input 2

analog in

31

FE_VREF_ADC

General purpose ADC Vtop reference output

analog out

32

FE_VREF_OUT

External Vref Pickup (decoupling cap 1nF)

analog out