29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
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binding for LTC2941, LTC2942, LTC2943 and LTC2944 battery gauges
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All chips measure battery capacity.
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The LTC2942 is pin compatible with the LTC2941, it adds voltage and
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temperature monitoring, and is runtime detected. LTC2943 and LTC2944
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is software compatible, uses a slightly different conversion formula
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for the charge counter and adds voltage, current and temperature monitoring.
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Required properties:
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- compatible: Should contain "lltc,ltc2941", "lltc,ltc2942", "lltc,ltc2943"
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or "lltc,ltc2944" which also indicates the type of I2C chip attached.
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- reg: The 7-bit I2C address.
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- lltc,resistor-sense: The sense resistor value in milli-ohms. Can be a 32-bit
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negative value when the battery has been connected to the wrong end of the
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resistor.
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- lltc,prescaler-exponent: The prescaler exponent as explained in the datasheet.
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This determines the range and accuracy of the gauge. The value is programmed
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into the chip only if it differs from the current setting. The setting is
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lost when the battery is disconnected.
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Example from the Topic Miami Florida board:
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fuelgauge: ltc2943@64 {
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compatible = "lltc,ltc2943";
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reg = <0x64>;
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lltc,resistor-sense = <15>;
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lltc,prescaler-exponent = <5>; /* 2^(2*5) = 1024 */
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};
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