BQ24160A_15 Datasheet, PDF (25/52 Pages) Texas Instruments – bq2416xx 2.5A, Dual-Input, Single-Cell Switched-Mode Li-Ion Battery Charger with Power Path Management and I2C Interface

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Feature Description (continued)
bq24160, bq24160A, bq24161
bq24161B, bq24163, bq24168
SLUSAO0F – NOVEMBER 2011 – REVISED JULY 2014
Figure 16. V(SYS) when Reverse Boost Prevention Circuit is Active
9.3.17 Charge Status Outputs (STAT, INT)
The STAT output is used to indicate operation conditions for bq2416xx. STAT is pulled low during charging when
EN_STAT bit in the control register (0x02h) is set to “1”. When charge is complete or disabled, STAT is high
impedance. When a fault occurs, a 128-µs pulse (interrupt) is sent out to notify the host. The status of STAT
during different operation conditions is summarized in Table 1. STAT drives an LED for visual indication or can
be connected to the logic rail for host communication. The EN_STAT bit in the control register (00H) is used to
enable/disable the charge status for STAT. The interrupt pulses are unaffected by EN_STAT and will always be
shown. The INT output is identical to STAT and is used to interface with a low voltage host processor.
Table 1. STAT Pin Summary
Charge State
Charge in progress and EN_STAT=1
Other normal conditions
Status Changes: Supply Status Change (plug in or removal), safety timer fault,
watchdog expiration, sleep mode, battery temperature fault (TS), battery fault
(OVP or absent), thermal shutdown
STAT and INT behavior
Low
High-Impedance
128-µs pulse, then High Impedance
9.3.18 Good Battery Monitor
The bq2416xx contains a good battery monitor circuit that places the bq2416xx into high-z mode if the battery
voltage is above the BATGD threshold while in DEFAULT mode. This function is used to enable compliance to
the battery charging standard that prevents charging from an un-enumerated USB host while the battery is above
the good battery threshold. If the bq2416xx is in HOST mode, it is assumed that USB host has been enumerated
and the good battery circuit has no effect on charging.
Copyright © 2011–2014, Texas Instruments Incorporated
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