ST7538Q datasheet(7/44 Pages) STMICROELECTRONICS

7 / 44 page

ST7538Q

Pin settings

7/44

SGND

Supply

Analog Signal Ground

XOUT

Analog Output

Crystal Output

XIN

Analog Input

Crystal Oscillator Input - External Clock Input

AVdd

Supply

Analog Power supply.

Vsense(3)

Analog/Input

Output Voltage Sensing input for the voltage control loop

TEST2

Analog/Input

Test Input must be connected SGND

RxFO

Analog/Output

Receiving Filter Output

RAI

Analog/Input

Receiving Analog Input

VDC

Power

5V Voltage Regulator Output

floating

Must Be connected to DVss.

TEST1

Digital/Input

with internal pull-down

Test input. Must Be connected to DVss.

REGOK

Digital/Output

Security checksum logic output

"1" - Stored data Corrupted

"0" - Stored data OK

C_MINUS(4) Analog/Input

Op-amp Inverting Input.

C_PLUS(5)

Analog/Input

Op-amp Not Inverting Input.

floating

Must Be connected to DVss

C_OUT

Analog/Output

Op-amp Output

GND

Supply

Substrate Ground (same function as PIN 6)

Digital/Output

Power Good logic Output

"1" - VDC is above 4.5V and DVdd is above 3.125V

"0" - VDC is below 4.25V or DVdd is below 2.875V

REG_DATA Digital/Input

with internal pull-down

Mains or Control Register Access Selector

"1" - Control Register Access

"0" - Mains Access

floating

Must be connected to DVss.

If not used this pin must be connected to VDC

Cannot be left floating

If not used this pin must be connected to VDC

If not used this pin must be tied low (SGND or PAVss or DVss)

Table 1. Pin description (continued)

Pin N°

Name

Type

Description

ST7538Q Datenblatt(PDF) 7 Page - STMicroelectronics

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