Datasheet

REGISTER INFORMATION
INA209
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......................................................................................................................................................... SBOS403B JUNE 2007 REVISED MARCH 2009
The INA209 uses a bank of registers for holding Register contents are updated 4 µ s after completion of
configuration settings, measurement results, the write command. Therefore, a 4 µ s delay is
maximum/minimum limits, and status information. required between completion of a write to a given
Table 2 summarizes the INA209 registers; Figure 14 register and a subsequent read of that register
illustrates registers. (without changing the pointer) when using SCL
frequencies in excess of 1MHz.
Table 2. Summary of Register Set
POINTER
ADDRESS POWER-ON RESET
HEX REGISTER NAME FUNCTION BINARY HEX TYPE
(1)
All-register reset, settings for bus
00 Configuration Register voltage range, PGA Gain, ADC 00111001 10011111 399F R/ W
resolution/averaging.
Status flags for warnings,
01 Status Register over-/under-limits, conversion ready, 00000000 00000000 0000 R
math overflow, and SMBus Alert.
SMBus Alert Mask/Enable Enables/disables flags in the Status
02 00000000 00000000 0000 R/ W
Control Register Register
03 Shunt Voltage Shunt voltage measurement data. 00000000 00000000 0000 R
04 Bus Voltage Bus voltage measurement data. 00000000 00000000 0000 R
05 Power Power measurement data. 00000000 00000000 0000 R
Contains the value of the current flowing
06 Current
(2)
00000000 00000000 0000 R
through the shunt resistor.
Shunt Voltage Positive Contains most positive voltage reading
07 10000000 00000000 8000 R/ W
Peak of Shunt Voltage Register.
Shunt Voltage Negative Contains most negative voltage reading
08 01111111 11111111 7FFF R/ W
Peak of Shunt Voltage Register.
Bus Voltage Maximum Contains highest voltage reading of Bus
09 00000000 00000000 0000 R/ W
Peak Voltage Register.
Bus Voltage Minimum Contains lowest voltage reading of Bus
0A 11111111 11111000 FFF8 R/ W
Peak Voltage Register.
Contains highest power reading of
0B Power Peak 00000000 00000000 0000 R/ W
Power Register.
Warning watchdog register. Sets
Shunt Voltage Positive positive shunt voltage limit that triggers
0C 00000000 00000000 0000 R/ W
Warning a warning flag in the Status Register,
and activates Warning pin.
Warning watchdog register. Sets
Shunt Voltage Negative negative shunt voltage limit that triggers
0D 00000000 00000000 0000 R/ W
Warning a warning flag in the Status Register,
and activates Warning pin.
Warning watchdog register. Sets power
limit that triggers a warning flag in the
0E Power Warning 00000000 00000000 0000 R/ W
Status Register, and activates Warning
pin.
Warning watchdog register. Sets high
Bus voltage limit that triggers a warning
Bus Over-Voltage
0F flag in the Status Register, and activates 00000000 00000000 0000 R/ W
Warning
Warning pin. Also contains bits to set
Warning pin polarity and latch feature.
(1) Type: R = Read-Only, R/ W = Read/Write.
(2) Current Register defaults to ' 0 ' because the Calibration Register defaults to ' 0 ' , yielding a zero current value until the Calibration Register
is programmed.
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