BQ2158 Datasheet, PDF (3/8 Pages) Texas Instruments – Three or Four Series Cell Li-Ion Pack Supervisor Module

Number of Cells
3 cells
4 cells
Table 2. Pin Connections
On-board bq2058 Configuration
BAT1N tied to BAT1P
NSEL = VSS
NSEL = VCC
bq2158
Operation
The bq2158 monitors each series element for under-
voltage, over-voltage, and over-current conditions. If a
cell falls below VUV for tUVD, the bq2158 enters into
sleep mode. The bq2158 wakes up and enables discharge
if a voltage, VCD higher than the battery voltage, is ap-
plied across POS and NEG. Charging is disabled if a cell
exceeds VOV for tOVD, and can resume when the cell falls
below the VCE threshold. The bq2158 turns the dis-
charge FET off if the steady state load current exceeds
IOC for tOCD and turns it back on if the load is removed.
B1P
NC
B1N
B2N
B3N
POS
Load
or
Charger
B1P
POS
B1N
Load
B2N
or
Charger
B3N
B4N
NEG
B4N
NEG
Three-Cell Configuration
Four-Cell Configuration
Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire.
B1N, B2N, and B3N accomodate a #24 AWG stranded wire.
FG2158cc.eps
Figure 1. Module Connection Diagram
3