bq30z554-R1

SLUSBD4 – OCTOBER 2013

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Authentication

•

The bq30z554-R1 supports authentication by the host using SHA-1.

•

SHA-1 authentication by the gas gauge is required for unsealing and full access.

Power Modes

The bq30z554-R1 supports five power modes to reduce power consumption:

•

In NORMAL mode, the bq30z554-R1 performs measurements, calculations, protection decisions, and data

updates in 0.25-s intervals. Between these intervals, the bq30z554-R1 is in a reduced power stage. In

addition, the device will provide information for peak TURBO mode power operation.

•

The bq30z554-R1 supports a TURBO mode operation by providing information to the host MCU about the

battery pack's ability to deliver peak power. The method of operation is based on the host MCU reading

register 0x59 (TURBO_POWER) to determine if the selected power level for TURBO mode operation of the

MCU is below the max power reported by the gas gauge. Additionally, the device reports current information

during the power pulse by reading register 0x5E (TURBO_CURRENT). The information reported by these two

registers allows the MCU to determine if the selected TURBO mode operation is safe and will not cause any

system reset due to transient power pulses.

•

In SLEEP mode, the bq30z554-R1 performs measurements, calculations, protection decisions, and data

updates in adjustable time intervals. Between these intervals, the bq30z554-R1 is in a reduced power stage.

The bq30z554-R1 has a wake function that enables exit from SLEEP mode when current flow or failure is

detected.

•

In SHUTDOWN mode, the bq30z554-R1 is completely disabled.

•

In SHIP mode, the bq30z554-R1 enters a low-power mode with no voltage, current, and temperature

measurements, the FETs are turned off, and the MCU is in a halt state. The device wakes up upon SMBus

communication detection.

NOTE

For a detailed description of the SBS Commands and Data Flash (DF) Registers, refer to

the bq30z554-R1 Technical Reference Manual (SLUUA79).

Configuration

System Present Operation

The bq30z554-R1 checks the PRES pin periodically (1 s). If PRES input is pulled to ground by the external

system, the bq30z554-R1 detects this as system present.

Battery Power Interrupt Operation

The bq30z554-R1 can interrupt the battery power by using an external push-button switch and detecting a low-

level threshold signal on the GPIO terminal (pin should be configured with an internal pull-up). Once the push

button is pressed, there is a delay of 1 s (default) for debounce to detect the low-level threshold. There is also a

data flash command for the battery power interrupt timeout. The default value is 30 minutes. If the push-button

switch is selected before this timeout, the battery power is restored based on this action.

Timeout Configuration

The timeout feature allows the battery power to be restored once the timer expires. Alternatively, if the value is

set to 0, this feature is disabled.

Subclass

Class

Subclass

Offset

Name

Type

Min

Max

Default

Unit

ID

Power

248

Power Off

0

Timeout

U2

0

65535

30

min

20

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