ST7538Q Pin settings
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25 SGND Supply Analog Signal Ground
26 XOUT Analog Output Crystal Output
27 XIN Analog Input Crystal Oscillator Input - External Clock Input
28 AVdd Supply Analog Power supply.
29
Vsense
(3)
Analog/Input Output Voltage Sensing input for the voltage control loop
30 TEST2 Analog/Input Test Input must be connected SGND
31 RxFO Analog/Output Receiving Filter Output
32 RAI Analog/Input Receiving Analog Input
33 VDC Power 5V Voltage Regulator Output
34 NC floating Must Be connected to DVss.
35 TEST1 Digital/Input
with internal pull-down
Test input. Must Be connected to DVss.
36 REGOK Digital/Output Security checksum logic output
"1" - Stored data Corrupted
"0" - Stored data OK
37
C_MINUS
(4)
Analog/Input Op-amp Inverting Input.
38
C_PLUS
(5)
Analog/Input Op-amp Not Inverting Input.
39 NC floating Must Be connected to DVss
40 C_OUT Analog/Output Op-amp Output
41 GND Supply Substrate Ground (same function as PIN 6)
42 PG 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
43 REG_DATA Digital/Input
with internal pull-down
Mains or Control Register Access Selector
"1" - Control Register Access
"0" - Mains Access
44 NC floating Must be connected to DVss.
1. If not used this pin must be connected to VDC
2. Cannot be left floating
3. Cannot be left floating
4. If not used this pin must be connected to VDC
5. If not used this pin must be tied low (SGND or PAVss or DVss)
Table 1. Pin description (continued)
Pin N° Name Type Description
