Datasheet

bq24272

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SLUSB09 –JUNE 2012

EN_NOBATOP (No Battery Operation with Termination Disabled)

The EN_NOBATOP bit is used to enable operation when termination is disabled and no battery is connected.

This is useful for cases where the PA is connected to the BAT pin and it desired to do a GSM calibration in the

factory. For this application, the TE bit (Bit 2 in Register 0x02h) should be set to a “0” to disable termination and

the EN_NOBATOP should be set to a “1”. This feature should not be used during normal operation as it disables

the BATOVP and the reverse boost protection circuits.

Control Register (READ/WRITE)

Memory location: 02, Reset state: 1000 1100

BIT NAME Read/Write FUNCTION

B7(MSB) RESET Write Only Write: 1-Reset all registers to default values

0-No effect

Read: always get “1”

B6 NA Read Only NA

B5 NA Read/Write NA

B4 NA Read/Write NA

B3 EN_STAT Read/Write 1-Enable STAT output to show charge status,

0-Disable STAT output for charge status. Fault interrupts are still show even when

EN_STAT = 0. (default 1)

B2 TE Read/Write 1-Enable charge current termination,

0-Disable charge current termination (default 1)

B1 CE Read/Write 1-Charger is disabled

0-Charger enabled (default 0)

B0 (LSB) HZ_MODE Read/Write 1-High impedance mode

0-Not high impedance mode (default 0)

RESET Bit

The RESET bit in the control register (0x02h) is used to reset all the charge parameters. Write “1” to RESET bit

to reset all the registers to default values and place the bq24272 into DEFAULT mode and turn off the watchdog

timer. The RESET bit is automatically cleared to zero once the bq24272 enters DEFAULT mode.

CE Bit (Charge Enable)

The CE bit in the control register (0x02h) is used to disable or enable the charge process. A low logic level (0) on

this bit enables the charge and a high logic level (1) disables the charge. When charge is disabled, the SYS

output regulates to VSYS(REG) and battery is disconnected from the SYS. Supplement mode is still available if

the system load demands cannot be met by the supply. BGATE is high impedance when CE is high.

Product Folder Link(s) :bq24272