BQ2023_16 Datasheet, PDF (3/32 Pages) Texas Instruments – SINGLE-WIRE ADVANCED BATTERY MONITOR IC

Not Recommended for New Designs
bq2023
SINGLEĆWIRE ADVANCED BATTERY MONITOR IC
FOR CELLULAR AND PDA APPLICATIONS
SLUS480B – MAY 2001
detailed description
register backup
The RBI input pin is used with a storage capacitor or external supply to provide backup potential to the internal
RAM and registers while V_CC is below the minimum operating voltage.
single-wire data input/output port
SDQ is a single-wire serial communications interface port. This bidirectional input/output communicates the
information to the host system. SDQ is compatible with Dallas Semiconductor’s 1-wiret interface.
pack removal detection
A low-level PDET input places the bq2023 in sleep mode and turns off the open-drain output of the STAT pin.
current sense inputs
The bq2023 interprets charge and discharge activity by monitoring and integrating the voltage drop, V_(SR),
across pins SRP and SRN. The SRP input connects to the sense resistor and the negative terminal of the
battery. The SRN input connects to the sense resistor and the negative terminal of the pack. V_(SRP) < V_(SRN)
indicates discharge, and V_(SRP) > V_(SRN) indicates charge.
absolute maximum ratings over operating free-air temperature (unless otherwise noted)^†
Supply voltage (V_CC with respect to GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Input voltage, V_I (SRP, SRN, PDET, RBI all with respect to GND) . . . . . . . . . . . . . . . . . . –0.3 V to V_CC + 0.3 V
Pullup voltage V_PU(SDQ and STAT pins) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Output current, I_O (STAT pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Output current, I_O(SDQ pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 mA
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20°C to 70°C
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Lead temperature (soldering, 10 s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
† _{Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and}
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
Operation range with flash write or erase capability, VCC
Operation range without flash write or erase capability, VCC
Pullup voltage on SDQ and STAT pins, V(PU)
Supply current, ICC(OP), See Note 1
Supply current, ICC(OP), See Note 2
Sleep current, I(SLEEP), See Note 3
Register back-up current, I(RBI), See Note 4
Operating ambient temperature, TA
Power-on reset voltage, V(POR)
NOTES:
1. VCC = 5 V, flash write or erase not active
2. VCC = 4.2 V, flash write or erase not active
3. VCC = 4.2 V, flash write or erase not active, excludes SDR register maintenance
4. RBI pin only, VCC < V(POR)
MIN NOM MAX UNIT
2.8
5.0
V
2.4
5.0
2.4
6.0
35
60
µA
32
40
1.0 1.5 µA
20 nA
–20
70 °C
2.0
2.34 V
1-wire is a trademark of Dallas Semiconductor.
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