Not Recommended for New Designs

bq28550-R1

www.ti.com

SLUSAS4A – OCTOBER 2012 – REVISED SEPTEMBER 2014

Table 7. Standard Commands (continued)

Name

Command Code

Min Value

Max Value

Default value

Units

Sealed Access

DeviceName()

0x21

—

—

bq28550-R1

ASCII

R/W

DeviceChemistry()

0x22

—

—

LION

ASCII

R/W

ManufacturerData()

0x23

—

—

—

ASCII

R/W

Authenticate()

0x2f

—

—

—

ASCII

R

CellVoltage1()

0x3f

0

65535

—

mV

R

Extended SBS Data Commands

OperationStatus()

0x54

0x0000

0xffff

—

0xf7f7

R

ChargingStatus()

0x55

0x0000

0xffff

—

—

R

UnSealKey()

0x60

0x00000000

0xffffffff

—

—

R/W

FullAccessKey()

0x61

0x00000000

0xffffffff

—

—

R/W

AuthenKey0()

0x63

0x00000000

0xffffffff

—

—

R/W

AuthenKey1()

0x64

0x00000000

0xffffffff

—

—

R/W

AuthenKey2()

0x65

0x00000000

0xffffffff

—

—

R/W

AuthenKey3()

0x66

0x00000000

0xffffffff

—

—

R/W

ManufacturerInfo()

0x70

—

—

—

ASCII

R/W

SenseResistor()

0x71

0

65535

—

µ

Ω

R/W

Temperature()

0x72

0x0000

0xffff

—

—

R

ManufacturerStatus()

0xB1

—

—

R

7.6.5.7.2

Run-Time-to-Empty

Battery pack run-time-to-empty can be calculated using the following method—the host system reads and stores

the following information during a discharge period and averages the data over a user-determined period of time:

•

The DSG bit of the BatteryStatus register is set to ensure DOUT terminal is high (ensure the system is in

discharge mode).

•

AverageCurrent (mA)

–

Positive value = Charge Current

–

Negative value = Discharge Current

–

One minute rolling average of current value (the user can accumulate this time for improved granularity)

•

RemainingCapacity (mAh)

Run-Time-to-Empty = RemainingCapacity (avg mAh) ÷ AverageCurrent (mA). This result will be in hours, and

therefore to convert to minutes, divide the results by 60.

7.6.5.7.3

Charging Time To Full

This is a read-only function that predicts the remaining time until battery reaches full charge in minutes based on

Average Current(). The computation accounts for the taper current time extension from the linear TTF

computation based on a fixed Average Current() rate of change of accumulation. A value of 65,535 indicates a

battery is NOT being charged.

7.6.5.7.4

Remaining Capacity Alert

To set a notification when battery capacity is below a pre-determined value, the user can set a Remaining

Capacity alarm alert in the system side. The Remaining Capacity value determined by the bq28550-R1 device is

compared to the user-selected value. If the Remaining Capacity value < the user-selected Remaining Capacity

threshold, the host system should instruct the user on what action is needed.

Copyright © 2012–2014, Texas Instruments Incorporated

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