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BQ77307
SLUSF60 – DECEMBER 2023
7 Detailed Description
7.1 Overview
The BQ77307 family is a highly integrated, accurate primary or secondary protector for 2-series to 7-series
Li-ion, Li-polymer, LiFePO
and temperature protections, which can be triggered and recovered completely autonomously by the device or
under full control of a host processor. Integrated FET drivers drive low-side charge and discharge protection
NFETs. A programmable LDO is included for external system use, with voltage programmable to 1.8 V, 2.5 V, 3.0
V, 3.3 V, or 5.0 V, capable of providing up to 20 mA.
The BQ77307 device includes one-time-programmable (OTP) memory, which TI programs to configure device
operation settings. A 400-kHz I
enable communication with a host processor to read status information. The device temperature protections
include support for an external thermistor, as well as internal die overtemperature protection. The BQ77307 is
available in a 20-pin QFN package
7.2 Functional Block Diagram
BAT
VC7
VC6
VC5
VC4
VC3
VC2
VC1
VC0
TS
VSS
7.3 Device Configuration
7.3.1 Commands and Subcommands
The BQ77307 device includes support for direct commands and subcommands. The direct commands are
accessed using a 7-bit command address sent from a host through the device serial communications interface
and either triggers an action, or provides a data value to be written to the device, or instructs the device to
report data back to the host. Subcommands are additional commands that are accessed indirectly using the
7-bit command address space and provide the capability for block data transfers. For more information on the
commands and subcommands the device supports, refer to
7.3.2 Configuration Using OTP or Registers
The BQ77307 device includes registers with values that are loaded automatically from one-time programmable
(OTP) memory. At initial power-up, the device loads OTP settings into registers, which are used by the device
during operation. The OTP settings are programmed into the device by TI during manufacturing. Register values
18
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(LFP), and LTO battery packs. Each device includes high-accuracy voltage, current,
4
2
C communication interface with optional CRC and an ALERT interrupt output
Internal LDO
MUX
Pullup resistor
SCD, OCD1, OCD2, OCC
Product Folder Links:
VREF1
OSC
Voltage
Protection
Subsystem
Registers
Digital Core
OTP
Trim & Settings
BQ77307 Technical Reference
Copyright © 2023 Texas Instruments Incorporated
BQ77307
www.ti.com
VREF2
LDO
1.8 / 2.5 /
REGSRC
3.0 / 3.3 /
5 V
REGOUT
CHG
CHG / DSG
Drivers
DSG
ALERT
SDA
I2C
SCL
Manual.
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