BQ35100 Datasheet, PDF (11/26 Pages) Texas Instruments – Lithium Primary Battery Fuel Gauge

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bq35100
SLUSCM6A – JUNE 2016 – REVISED JULY 2016
Feature Description (continued)
7.3.3 Power Control
The bq35100 only has one active power mode that is enabled through the GAUGE_ENABLE (GE) pin. The
power consumption of the bq35100 can change significantly based on host commands that it receives and its
default configuration, specifically with respect to data flash updates.
7.3.4 Battery Condition Warnings
7.3.4.1 Battery Low Warning
The bq35100 can indicate and optionally trigger the ALERT pin when the primary battery voltage falls below a
programmable threshold.
7.3.4.2 Temperature Low Warning
The bq35100 can indicate and optionally trigger the ALERT pin when the primary battery temperature falls below
a programmable threshold.
7.3.4.3 Temperature High Warning
The bq35100 can indicate and optionally trigger the ALERT pin when the primary battery temperature rises
above a programmable threshold.
7.3.4.4 Battery Low SOH Warning
The bq35100 can indicate and optionally trigger the ALERT pin when the primary battery state-of-health (SOH)
falls below a programmable threshold.
7.3.4.5 Battery EOS OCV BAD Warning
The device assumes that when GE is asserted the cell is at rest and uses the initialization voltage reading to
determine the Open Circuit Voltage (OCV). If the cell was not fully relaxed at that point, then the voltage after the
pulse could rise above the OCV. This causes an incorrect impedance to be calculated.
7.3.5 ALERT Signal
The ALERT signal can be configured to be triggered by a variety of status conditions. When the ALERT
Configuration bit is set AND the corresponding bit in BatteryStatus() or ControlStatus() is set, then the
corresponding BatteryAlert() bit is set, triggering the ALERT signal.
7.3.6 Lifetime Data Collection
The bq35100 can be enabled by writing to Control() 0x002E [LT_EN] to gather data regarding the primary battery
and store it to data flash.
The following data is collected in RAM and only written to DF when the host sends the End command to the
device:
• Max and Min Cell Voltage
• Max and Min Discharge Current
• Max and Min Temperature
7.3.7 SHA-1 Authentication
As of March 2012, the latest revision is FIPS 180-4. SHA-1, or secure hash algorithm, is used to compute a
condensed representation of a message or data also known as hash. For messages < 2⁶⁴, the SHA-1 algorithm
produces a 160-bit output called a digest.
In a SHA-1 one-way hash function, there is no known mathematical method of computing the input given, only
the output. The specification of SHA-1, as defined by FIPS 180-4, states that the input consists of 512-bit blocks
with a total input length less than 2⁶⁴ bits. Inputs that do not conform to integer multiples of 512-bit blocks are
padded before any block is input to the hash function. The SHA-1 algorithm outputs the 160-bit digest.
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