BQ2057CSN BENCHMARQ, BQ2057CSN Datasheet - Page 14

• Manufacturer Part Number: BQ2057CSN
• Description: PROG BATTERY CHARGER, 2057, SOIC8
• Manufacturer: BENCHMARQ

Specifications of BQ2057CSN

• Battery Type: Li-Ion / Li-Polymer
• Input Voltage: 15V
• Battery Charge Voltage: 4.2V
• Charge Current Max: 2A
• Battery Ic Case Style: SOIC
• No. Of Pins: 8
• No. Of Series Cells: 1
• Operating Temperature: RoHS Compliant

14
SLUS025F − MAY 2001 − REVISED JULY 2002
charge inhibit function
charge status indication
low-power sleep mode
The TS pin can be used as charge-inhibit input. The user can inhibit charge by connecting the TS pin to VCC
or VSS (or any level outside the V
thresholds to pin TS returns the charger to normal operation.
The bq2057 reports the status of the charger on the 3-state STAT pin. The following table summarized the
operation of the STAT pin.
The STAT pin can be used to drive a single LED (Figure 1), dual-chip LEDs (Figure 4) or for interface to a host
or system processor (Figure 11). When interfacing the bq2057 to a processor, the user can use an output port,
as shown in Figure 11, to recognize the high-Z state of the STAT pin. In this configuration, the user needs to
read the input pin, toggle the output port and read the STAT pin again. In a high-Z condition, the input port always
matches the signal level on the output port.
The bq2057 enters the sleep mode if the VCC falls below the voltage at the BAT input. This feature prevents
draining the battery pack during the absence of VCC.
Figure 11. Interfacing the bq2057 to a Host Processor
Battery conditioning and charging
Temperature fault or sleep mode
SNS
BAT
VCC
TS
Charge complete (Done)
bq2057CTS
(TS1)
APPLICATION INFORMATION
CONDITION
COMP
to V
STAT
VSS
CC
(TS2)
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thresholds). Applying a voltage between the V
OUT
IN
Processor
STAT PIN
Host
High
Low
Hi-Z
(TS1)
and V
(TS2)