Datasheet

MAX11359A
16-Bit Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
53
Maxim Integrated
This register is the internal temperature sensor calibra-
tion register.
TGAIN<7:0>: Factory-preset temperature gain correction
coefficient bits. This is the linear scaling factor used to
derive absolute temperature values from temperature val-
ues measured with the internal temperature sensor
(T
ACTUAL
= T
MEAS
x T
GAIN
+ T
OFFS
). The coefficients are
optimized for an internal voltage reference of 1.25V using
the four-current method. The power-on default varies.
TOFFS<5:0>: Factory-preset temperature offset cor-
rection coefficient bits. This is the linear offset factor
used to derive absolute temperature values from tem-
perature values measured with the internal temperature
sensor (T
ACTUAL
= T
MEAS
x T
GAIN
+ T
OFFS
). The coeffi-
cients are optimized for an internal voltage reference of
1.25V using the four-current method. The power-on
default varies.
The temperature-sensor control register controls the
internal and external temperature measurement.
IMUX<1:0>: Internal current-source MUX bits. Selects
the pin to be driven by the internal current sources as
shown in Table 20. The power-on default is 00.
IVAL<1:0>: Internal current-source value bits. Selects
the value of the internal current source as shown in
Table 21. The power-on default is 00.
MSB LSB
IMUX1 IMUX0 IVAL1 IVAL0 X X X X
TEMP_CTRL Register (Power-On State: 0000 XXXX)
CURRENT SOURCE IMUX1 IMUX0
Disabled 0 0
Internal temperature sensor 0 1
AIN1 1 0
AIN2 1 1
Table 20. Selecting Internal Current Source
CURRENT TYPICAL CURRENT (µA) IVAL1 IVAL0
I
1
400
I
2
60 0 1
I
3
64 1 0
I
4
120 1 1
Table 21. Setting the Current Level
MSB
TGAIN7 TGAIN6 TGAIN5 TGAIN4 TGAIN3 TGAIN2 TGAIN1 TGAIN0
LSB
TOFFS5 TOFFS4 TOFFS3 TOFFS2 TOFFS1 TOFFS0 X X
TEMP_CAL Register (Power-On State: Varies By Factory Calibration)