1*4882a593SmuzhiyunKernel driver ina3221 2*4882a593Smuzhiyun===================== 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunSupported chips: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun * Texas Instruments INA3221 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun Prefix: 'ina3221' 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun Addresses: I2C 0x40 - 0x43 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun Datasheet: Publicly available at the Texas Instruments website 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun https://www.ti.com/ 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunAuthor: Andrew F. Davis <afd@ti.com> 17*4882a593Smuzhiyun 18*4882a593SmuzhiyunDescription 19*4882a593Smuzhiyun----------- 20*4882a593Smuzhiyun 21*4882a593SmuzhiyunThe Texas Instruments INA3221 monitors voltage, current, and power on the high 22*4882a593Smuzhiyunside of up to three D.C. power supplies. The INA3221 monitors both shunt drop 23*4882a593Smuzhiyunand supply voltage, with programmable conversion times and averaging, current 24*4882a593Smuzhiyunand power are calculated host-side from these. 25*4882a593Smuzhiyun 26*4882a593SmuzhiyunSysfs entries 27*4882a593Smuzhiyun------------- 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun======================= ======================================================= 30*4882a593Smuzhiyunin[123]_label Voltage channel labels 31*4882a593Smuzhiyunin[123]_enable Voltage channel enable controls 32*4882a593Smuzhiyunin[123]_input Bus voltage(mV) channels 33*4882a593Smuzhiyuncurr[123]_input Current(mA) measurement channels 34*4882a593Smuzhiyunshunt[123]_resistor Shunt resistance(uOhm) channels 35*4882a593Smuzhiyuncurr[123]_crit Critical alert current(mA) setting, activates the 36*4882a593Smuzhiyun corresponding alarm when the respective current 37*4882a593Smuzhiyun is above this value 38*4882a593Smuzhiyuncurr[123]_crit_alarm Critical alert current limit exceeded 39*4882a593Smuzhiyuncurr[123]_max Warning alert current(mA) setting, activates the 40*4882a593Smuzhiyun corresponding alarm when the respective current 41*4882a593Smuzhiyun average is above this value. 42*4882a593Smuzhiyuncurr[123]_max_alarm Warning alert current limit exceeded 43*4882a593Smuzhiyunin[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively 44*4882a593Smuzhiyunin7_input Sum of shunt voltage(uV) channels 45*4882a593Smuzhiyunin7_label Channel label for sum of shunt voltage 46*4882a593Smuzhiyuncurr4_input Sum of current(mA) measurement channels, 47*4882a593Smuzhiyun (only available when all channels use the same resistor 48*4882a593Smuzhiyun value for their shunt resistors) 49*4882a593Smuzhiyuncurr4_crit Critical alert current(mA) setting for sum of current 50*4882a593Smuzhiyun measurements, activates the corresponding alarm 51*4882a593Smuzhiyun when the respective current is above this value 52*4882a593Smuzhiyun (only effective when all channels use the same resistor 53*4882a593Smuzhiyun value for their shunt resistors) 54*4882a593Smuzhiyuncurr4_crit_alarm Critical alert current limit exceeded for sum of 55*4882a593Smuzhiyun current measurements. 56*4882a593Smuzhiyunsamples Number of samples using in the averaging mode. 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun Supports the list of number of samples: 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun 1, 4, 16, 64, 128, 256, 512, 1024 61*4882a593Smuzhiyun 62*4882a593Smuzhiyunupdate_interval Data conversion time in millisecond, following: 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun update_interval = C x S x (BC + SC) 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun * C: number of enabled channels 67*4882a593Smuzhiyun * S: number of samples 68*4882a593Smuzhiyun * BC: bus-voltage conversion time in millisecond 69*4882a593Smuzhiyun * SC: shunt-voltage conversion time in millisecond 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun Affects both Bus- and Shunt-voltage conversion time. 72*4882a593Smuzhiyun Note that setting update_interval to 0ms sets both BC 73*4882a593Smuzhiyun and SC to 140 us (minimum conversion time). 74*4882a593Smuzhiyun======================= ======================================================= 75