Si3220/25
4. Pin Descriptions: Si3220/25
SRINGDCa
SRINGDCa
SRINGACa
SRINGACa
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
SVBATa
RPOa
RPIa
RNIa
RNOa
CAPPa
CAPMa
QGND
IREF
CAPMb
CAPPb
RNOb
RNIb
RPIb
RPOb
SVBATb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
ITIPNb
ITIPPb
IRINGNb
STIPACb
SRINGDCb
STIPDCb
IRINGPb
THERMb
GPOb
GND2
SRINGACb
BATSELb
VDD2
TRD1b
TRD2b
NC
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
48
47
46
45
44
43
GPOa
CS
SDITHRU
SDI
SDO
SCLK
VDD4
GND4
INT
PCLK
GND3
VDD3
DTX
DRX
FSYNC
RESET
BATSELa
BATSELa
STIPDCa
STIPDCa
STIPACa
STIPACa
THERMa
BLKRNG
IRINGNa
IRINGNa
IRINGPa
IRINGPa
THERM
a
NC
RTRPa
TRD1a
TRD2a
TRD1a
TRD2a
ITIPNa
ITIPNa
ITIPPa
ITIPPa
GND1
GND1
VDD1
VDD1
NC
SVBATa
RPOa
RPIa
RNIa
RNOa
CAPPa
CAPMa
QGND
IREF
CAPMb
CAPPb
RNOb
RNIb
RPIb
RPOb
SVBATb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SRINGACb
THERMb
ITIPNb
ITIPPb
IRINGNb
IRINGPb
RTRPb
GND2
TRD1b
SRINGDCb
TRD2b
VDD2
48
47
46
45
44
43
RRDa
CS
SDITHRU
SDI
SDO
SCLK
VDD4
GND4
INT
PCLK
GND3
VDD3
DTX
DRX
FSYNC
RESET
Si3220
64-Lead TQFP
(epad)
42
41
40
39
38
37
36
35
34
33
Si3225
64-Lead TQFP
(epad)
42
41
40
39
38
37
36
35
34
33
Pin Number(s)
Si3220
Si3225
Symbol
Input/
Output
Description
1, 16
2,15
3, 14
4, 13
5, 12
6, 11
1, 16
2,15
3, 14
4, 13
5, 12
6, 11
SVBATa,
SVBATb
RPOa, RPOb
RPIa,
RPIb
RNIa,
RNIb
RNOa, RNOb
CAPPa,
CAPPb
CAPMa,
CAPMb
QGND
I
O
I
I
O
Battery Sensing Input.
Analog current input used to sense battery voltage.
Transconductance Amplifier External Resistor Connec-
tion.
Transconductance Amplifier External Resistor Connec-
tion.
Transconductance Amplifier Resistor Connection.
Transconductance Amplifier Resistor Connection.
Differential Capacitor.
Capacitor used in low-pass filter to stabilize SLIC feedback
loops.
Common Mode Capacitor.
Capacitor used in low-pass filter to stabilize SLIC feedback
loops.
Component Reference Ground.
Return path for differential and common-mode capacitors. Do
not connect to system ground.
7, 10
7, 10
8
8
100
Rev. 1.2
BATSELb
STIPDCb
STIPACb
RRDb
SILABS [ SILICON LABORATORIES ]
