X3100 Datasheet, PDF (9/40 Pages) Xicor Inc. – 3 or 4 Cell Li-Ion Battery Protection and Monitor IC

X3100, X3101
CONFIGURATION REGISTER
The X3100 and X3101 can be configured for specific
user requirements using the Configuration Register.
Table 1. Configuration Register Functionality
Bit(s)
0-5
6
7
8-9
10-11
12-13
14-15
Name
–
SWCEN
CELLN
VCE1-VCE0
VOC1-VOC0
VUV1-VUV0
VOV1-VOV0
Function
(don’t care)
Switch Cell Charge Enable
threshold function ON/OFF
Set the number of Li-Ion battery
cells used (3 or 4)
Select Cell Charge Enable
threshold
Select over-current threshold
Select over-discharge (under
voltage) threshold
Select over-charge voltage
threshold
Table 2. Configuration Register—Upper Byte
15 14 13 12 11 10 9 8
VOV1 VOV0 VUV1 VUV0 VOC1 VOC0 VCE1 VCE0
X3100 Default = 33H; X3101 Default = 03H.
Table 3. Configuration Register—Lower Byte
7
6
543210
CELLN SWCEN x x x x x x
X3100 Default = C0H; X3101 Default = 40H.
Over-charge Voltage Settings
VOV1 and VOV0 control the cell over-charge level.
See section “Over-charge Protection” on page 14.
Table 4. Over-charge Voltage Threshold Selection
Configuration Register
Bits
VOV1
VOV0
Operation
0
0
V_OV = 4.20V (Default)
0
1
V_OV = 4.25V
1
0
V_OV = 4.30V
1
1
V_OV = 4.35V
Over-discharge Settings
VUV1 and VUV0 control the cell over-discharge
(under voltage threshold) level. See section “Over-dis-
charge Protection” on page 16.
Table 5. Over-discharge Threshold Selection.
Configuration
Register Bits
VUV1 VUV0
0
0
0
1
1
0
1
1
Operation
X3100
X3101
V_UV = 1.95V V_UV = 2.25V
(X3101 default)
V_UV = 2.05V
V_UV = 2.15V
V_UV = 2.25V
(X3100 default)
V_UV = 2.35V
V_UV = 2.45V
V_UV = 2.55V
Over-current Settings
VOC1 and VOC0 control the pack over-current level.
See section “Over-Current Protection” on page 19.
Table 6. Over-Current Threshold Voltage Selection.
Configuration Register
Bits
VOC1
VOC0
Operation
0
0
V_OC = 0.075V (Default)
0
1
V_OC = 0.100V
1
0
V_OC = 0.125V
1
1
V_OC = 0.150V
Cell Charge Enable Settings
VCE1, VCE0 and SWCEN control the pack charge
enable function. SWCEN enables or disables a circuit
that prevents charging if the cells are at too low a volt-
age. VCE1 and VCE0 select the voltage that is recog-
nized as too low. See section “Sleep Mode” on page 16.
Table 7. Cell Charge Enable Function
Configuration
Register Bit
SWCEN
Operation
0
Charge enable function: ON
1
Charge enable function: OFF
9
FN8110.0
April 11, 2005