Overvoltage threshold register format, Table 5. vov register programmability – Rainbow Electronics DS2778 User Manual
Page 27
DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
______________________________________________________________________________________
27
Overvoltage Threshold Register Format
The 8-bit Overvoltage Threshold register (VOV) sets the overvoltage threshold for the protection circuitry. An over-
voltage condition is detected if either of the voltages on V
IN1
or V
IN2
exceeds the OV threshold for t
OVD
. The LSB of
the VOV register is 2 x 5V/1024 = 31.25mV. The V
OV
set point can be calculated by the following formula.
V
OV
= (678 + 2 x Overvoltage_Threshold_Register_Value) x 5V/1024
Example:
Overvoltage Threshold register = 1110110b = 118D
V
OV
= (678 + 2 x 118) x 5V/1024 = 4.46289V
Overvoltage Threshold Register (7Fh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
X VOV6 VOV5 VOV4 VOV3 VOV2 VOV1 VOV0
VOV[6:0] BIT FIELD
V
OV
0 0 0 0 0 0 0
3.311
0 0 0 0 0 0 1
3.320
0 0 0 0 0 1 0
3.330
0 0 0 0 0 1 1
3.340
0 0 0 0 1 0 0
3.350
0 0 0 0 1 0 1
3.359
0 0 0 0 1 1 0
3.369
0 0 0 0 1 1 1
3.379
0 0 0 1 0 0 0
3.389
0 0 0 1 0 0 1
3.398
0 0 0 1 0 1 0
3.408
0 0 0 1 0 1 1
3.418
0 0 0 1 1 0 0
3.428
0 0 0 1 1 0 1
3.438
0 0 0 1 1 1 0
3.447
0 0 0 1 1 1 1
3.457
... ...
VOV[6:0] BIT FIELD
V
OV
1 1 1 0 0 0 0
4.404
1 1 1 0 0 0 1
4.414
1 1 1 0 0 1 0
4.424
1 1 1 0 0 1 1
4.434
1 1 1 0 1 0 0
4.443
1 1 1 0 1 0 1
4.453
1 1 1 0 1 1 0
4.463
1 1 1 0 1 1 1
4.473
1 1 1 1 0 0 0
4.482
1 1 1 1 0 0 1
4.492
1 1 1 1 0 1 0
4.502
1 1 1 1 0 1 1
4.512
1 1 1 1 1 0 0
4.521
1 1 1 1 1 0 1
4.531
1 1 1 1 1 1 0
4.541
1 1 1 1 1 1 1
4.551
Table 5. VOV Register Programmability