Datasheet

ADC Sense Resistor Gain +
625
(R
s
)
bq2060A
www.ti.com SLUS500D –OCTOBER 2001– REVISED OCTOBER 2011
1 DFC pin is high
CVOV
The CVOV bit indicates that a secondary Li-ion protection limit has been exceeded. It is set if any individual cell
exceeds the programmed high voltage limit, if the pack voltage exceeds the overvoltage threshold, or if an
overtemperature condition occurs. The bit is not latched and merely reflects the present overvoltage status.
0 No secondary protection limits exceeded
1 A secondary protection limit exceeded
CVUV
The CVUV bit indicates if any individual cell falls below the programmed low-voltage limit. The bit applies to
lithium batteries only. The bit is not latched and merely reflects the present undervoltage status.
0 All series cells are above the low-voltage limit
1 A series cell is below the low-voltage limit
VCELL4–VCELL1 (0x3c–0x3f); [0x3c–0x3f]
These functions return the calculated voltages in mV at the VCELL
4
through VCELL
1
inputs.
EEPROM
General
The bq2060A accesses the external EEPROM during a full reset and when storing historical data. During an
EEPROM access, the VOUT pin becomes active, and the bq2060A uses the ESCL and ESDA pins to
communicate with the EEPROM. The EEPROM stores basic configuration information for use by the bq2060A.
The EEPROM must be programmed correctly for proper bq2060A operation.
CAUTION
Recent changes to some EEPROM ICs have made the timing of the V
OUT
pin
unreliable. It is strongly recommended that the EEPROM is powered from the V
CC
pin
(pin 7). Also, it is acceptable to short pins 6 and 7, if needed.
Memory Map
Table 10 shows the memory map for the EEPROM. It also contains example data for a 10-series NiMH and a
3s3p Li-ion battery pack with a 0.05-Ω sense resistor.
EEPROM Programming
The following sections describes the function of each EEPROM location and how the data is to be stored.
Fundamental Parameters
Sense Resistor Value
Two factors are used to scale the current-related measurements. The 16-bit ADC Sense Resistor Gain value in
EE 0x68–0x69 scales Current() to mA. Adjusting ADC Sense Resistor Gain from its nominal value provides a
method to calibrate the current readings for system errors and the sense resistor value ®
S
) The nominal value is
set by
(4)
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