6 * Texas Instruments INA3221
10 Addresses: I2C 0x40 - 0x43
12 Datasheet: Publicly available at the Texas Instruments website
16 Author: Andrew F. Davis <afd@ti.com>
21 The Texas Instruments INA3221 monitors voltage, current, and power on the high
22 side of up to three D.C. power supplies. The INA3221 monitors both shunt drop
23 and supply voltage, with programmable conversion times and averaging, current
24 and power are calculated host-side from these.
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30 in[123]_label Voltage channel labels
31 in[123]_enable Voltage channel enable controls
32 in[123]_input Bus voltage(mV) channels
33 curr[123]_input Current(mA) measurement channels
34 shunt[123]_resistor Shunt resistance(uOhm) channels
35 curr[123]_crit Critical alert current(mA) setting, activates the
36 corresponding alarm when the respective current
38 curr[123]_crit_alarm Critical alert current limit exceeded
39 curr[123]_max Warning alert current(mA) setting, activates the
40 corresponding alarm when the respective current
41 average is above this value.
42 curr[123]_max_alarm Warning alert current limit exceeded
43 in[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively
44 samples Number of samples using in the averaging mode.
46 Supports the list of number of samples:
48 1, 4, 16, 64, 128, 256, 512, 1024
50 update_interval Data conversion time in millisecond, following:
52 update_interval = C x S x (BC + SC)
54 * C: number of enabled channels
55 * S: number of samples
56 * BC: bus-voltage conversion time in millisecond
57 * SC: shunt-voltage conversion time in millisecond
59 Affects both Bus- and Shunt-voltage conversion time.
60 Note that setting update_interval to 0ms sets both BC
61 and SC to 140 us (minimum conversion time).
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