Si3220/Si3225
Pin Descriptions: Si3220/25
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
SVBATa
RPOa
RPIa
GPOa
CS
SVBATa
RPOa
RPIa
RRDa
CS
1
2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
1
2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
SDITHRU
SDI
3
3
SDITHRU
SDI
RNIa
4
RNIa
4
5
RNOa
CAPPa
CAPMa
QGND
IREF
5
SDO
RNOa
CAPPa
CAPMa
QGND
IREF
SDO
6
SCLK
VDD4
GND4
INT
SCLK
VDD4
GND4
INT
6
7
7
Si3220
64-Lead TQFP
(epad)
Si3225
64-Lead TQFP
(epad)
8
8
9
9
CAPMb
CAPPb
RNOb
RNIb
10
11
12
13
14
15
16
PCLK
GND3
VDD3
DTX
CAPMb
CAPPb
RNOb
RNIb
10
11
12
13
14
15
16
PCLK
GND3
VDD3
DTX
RPIb
DRX
RPIb
DRX
RPOb
SVBATb
FSYNC
RESET
RPOb
SVBATb
FSYNC
RESET
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Symbol
Input/
Description
Pin Number(s)
Output
Si3220 Si3225
SVBATa,
SVBATb
I
O
I
Battery Sensing Input.
1, 16
1, 16
Analog current input used to sense battery voltage.
RPOa, RPOb
Transconductance Amplifier External Resistor Connec-
tion.
2,15
2,15
RPIa,
RPIb
Transconductance Amplifier External Resistor Connec-
tion.
3, 14
4, 13
3, 14
4, 13
RNIa,
RNIb
I
Transconductance Amplifier Resistor Connection.
RNOa, RNOb
O
Transconductance Amplifier Resistor Connection.
5, 12
6, 11
5, 12
6, 11
CAPPa,
CAPPb
Differential Capacitor.
Capacitor used in low-pass filter to stabilize SLIC feedback
loops.
CAPMa,
CAPMb
Common Mode Capacitor.
7, 10
8
7, 10
8
Capacitor used in low-pass filter to stabilize SLIC feedback
loops.
QGND
Component Reference Ground.
Return path for differential and common-mode capacitors. Do
not connect to system ground.
96
Rev. 1.0
SILICONIMAGE [ Silicon image ]
