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PIN DESCRIPTION
Pin No.
Symbol
1, 2
N.C.
3, 4
OUT3
5
GND3
6, 7
OUT2
8, 9, 10, 11
VBAT1
12, 13
OUT1
14
CONT1
15
CONT6
16
CONT2
17
XPOWERGOOD
18
DELAYCAP
19
GND1
20
VBAT2
21
V-BACKUP
22
VREF
23
VFIL
24
REF-OUT
25
VCC-VSIM
26
VSIM-ON
27
SIMPROG
28
OSC
29
VSIMOUT
30
VCAP
31
VCAP
32
GND-VSIM
33
RESET-IN
34
CLK-IN
35
P-IO
36
RST
37
CLK
38
SIM-IO
39
GND4
40, 41
OUT4
I/O
Non connection.
O
LDO3 output pin.
LDO3 ground pin.
O
LDO2 output pin.
Battery voltage input pin for LDO1 and LDO2.
O
LDO1 output pin.
I
Power on input from keypad (Active low, Pulled up to VBAT2).
I
"CONT6" input from digital system P (Active high).
I
External accessory supply voltage Enable (Active high).
O
Generates the main reset. (Active low, when OUT1 is out of regulation).
Timing capacitor for XPOWERGOOD delay.
LDO1, LDO2, V-BACKUP, Reference and System ground pin.
Battery voltage input pin for both UVLO's, Reference and V-BACKUP
LDO.
O
Supply voltage for Charger for rechargeable Lithium coin cell.
O
Supply voltage for Reference.
O
Reference voltage Filter.
O
Reference output voltage (Present when BACKUP UVLO is high).
Input voltage for charge pump. (Supplied by VBAT1).
I
VSIM supply Enable (Active high).
I
VSIM programming: Low = 3 V SIM, High = 5 V SIM.
Oscillator output pin.
O
Supply voltage for 3 or 5 V SIM-Card (SmartCard).
Positive side of boost capacitor.
Negative side of boost capacitor.
3 or 5 V SIM-Card (SmartCard) ground pin.
I
Non level shifted SIM reset ( P side).
I
Non level shifted clock ( P side).
I/O
Non level shifted bi-directional data input/output ( P side).
O
Level shifted SIM reset (SmartCard side).
O
Level shifted SIM clock (SmartCard side).
I/O
Level shifted bi-directional SIM data input/output (SmartCard side).
LDO4 ground pin.
O
LDO4 output pin.
MB3891
Descriptions
(Continued)
3
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