MAX1359B Maxim Integrated Products, MAX1359B Datasheet - Page 53

• Manufacturer Part Number: MAX1359B
• Description: Data-Acquisition System
• Manufacturer: Maxim Integrated Products

DataSheet.in
SPDT2<1:0>: Single-pole double-throw switch 2 control
bits. The SPDT2<1:0> bits, the UPIO pins (if config-
ured), and the PWM (if configured) control the state of
the switch as shown in Table 19. The UPIO_ states of 0
and 1 in the table correspond to respective deasserted
and asserted logic states as defined by the ALH_ bit in
the UPIO_CTRL register. If a UPIO is not configured for
this mode, its value applied to Table 19 is 0. The PWM
states of 0 and 1 in Table 19 correspond to the respec-
tive PWM off (low) and on (high) states defined by the
SPD2 bit in the PWM_CTRL register. If the PWM is not
configured for this mode, its value applied to Table 19 is
0. The power-on default is 00.
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
TUAL
correct for delta V
errors, and assumes the measurement is taken with a ref-
erence voltage that is either exactly 1.250V, or an exact
value known by the user. The errors being corrected by
this factor are variables in the internal temperature-sens-
ing diode. This factor is programmed to typical values.
The power-on default varies.
TEMP_CTRL Register (Power-On State: 0000 XXXX)
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.
Table 20. Selecting Internal Current Source
TEMP_CAL Register (Power-On State: Varies By Factory Calibration)
UPIOs, RTC, Voltage Monitors, and Temp Sensor
Internal temperature sensor
16-Bit, Data-Acquisition System with ADC, DAC,
TGAIN7
TOFFS5
IMUX1
CURRENT SOURCE
MSB
MSB
= T
MEAS
Disabled
AIN1
AIN2
x T
GAIN
TGAIN6
TOFFS4
______________________________________________________________________________________
IMUX0
BE
absolute voltage measurement
+ T
OFFS
). This method does not
IMUX1
TGAIN5
TOFFS3
IVAL1
0
0
1
1
IMUX0
TGAIN4
TOFFS2
IVAL0
0
1
0
1
AC-
IVAL<1:0>: Internal current-source value bits. Selects
the value of internal current source as shown in Table
21. The power-on default is 00.
TOFFS<5:0>: Factory-preset temperature offset correc-
tion coefficient bits. This is the linear offset factor used
to derive absolute temperature values from temperature
values measured with the internal temperature sensor
(T
does not correct for delta V
surement errors, and assumes the measurement was
taken with a reference voltage that is either exactly
1.250V, or an exact value known by the user. The errors
being corrected by this factor are variables in the inter-
nal temperature-sensing diode. This factor is based on
characterization data. The power-on default varies.
Table 19. SPDT Switch 2 States
X = Don’t care.
* Switch SPDT2 control is effectively an OR of the SPDT20 bit, the
UPIO pins, and the PWM output. The SPDT21 bit determines if
the switches open and close together or if they toggle.
Table 21. Setting the Current Level
SPDT2<1:0> UPIO_* PWM*
CURRENT
TOFFS1
TGAIN3
ACTUAL
0
0
0
0
1
1
1
1
X
I
I
I
I
1
2
3
4
0
X
X
1
0
X
X
1
= T
TYPICAL CURRENT (µA)
MEAS
TGAIN2
TOFFS0
0
X
1
X
0
X
1
X
X
x T
120
60
64
4
0
1
X
X
0
1
X
X
GAIN
BE
TGAIN1
+ T
SPDT2 SWITCH STATE
SNO2 open, SNC2 open
SNO2 closed, SNC2 closed
SNO2 closed, SNC2 closed
SNO2 closed, SNC2 closed
SNC2 closed, SNO2 open
SNC2 open, SNO2 closed
SNC2 open, SNO2 closed
SNC2 open, SNO2 closed
absolute voltage mea-
X
X
OFFS
). This method
IVAL1
0
0
1
1
TGAIN0
LSB
LSB
X
X
IVAL0
0
1
0
1
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