Datasheet

ADT7411
Rev. B | Page 24 of 36
Table 31.
Bit Function
C3:C0
In single-channel mode, these bits select between V
DD
,
the internal temperature sensor, external temperature
sensor/AIN1, AIN2 to AIN8 for conversion. The default is V
DD
.
0000 = V
DD
.
0001 = Internal Temperature Sensor.
0010 = External Temperature Sensor/AIN1. (Bit C1 and
Bit C2 of C
ontrol Configuration 1 affect this selection.)
0011 = AIN2.
0100 = AIN3.
0101 = AIN4.
0110 = AIN5.
0111 = AIN6.
1000 = AIN7.
1001 = AIN8.
1010 to 1111 = Reserved.
C4
Selects between single-channel and round robin
c
onversion cycle. Default is round robin.
0 = Round robin.
1 = Single-channel.
C5
Default condition is to average every measurement on
all ch
annels 16 times. This bit disables this averaging.
Channels affected are temperature, analog inputs, and V
DD
.
0 = Enable averaging.
1 = Disable averaging.
C6
SMBus timeout on the serial clock puts a 25 ms limit on
the pulse width of the clock
, ensuring that a fault on the
master SCL does not lock up the SDA line.
0 = Disable SMBus timeout.
1 = Enable SMBus timeout.
C7
Software Reset. Setting this bit t
o a 1 causes a software
reset. All registers reset to their default settings.
Control Configuration 3 Register (Read/Write)
[Address = 1Ah]
This configuration register is an 8-bit read/write register that is
used to set up some of the operating modes of the ADT7411.
Table 32. Control Configuration 3
D7 D6 D5 D4 D3 D2 D1 D0
C7 C6 C5 C4 C3 C2 C1 C0
0
1
0
1
0
1
0
1
1
1
0
1
0
1
0
1
1
Default settings at power-up.
Table 33.
Bit Function
C0 Selects between fast and normal ADC conversion speeds.
0 = ADC clock at 1.4 kHz.
1 = ADC clock at 22.5 kHz. D+ and D− analog filters
ar
e disabled.
C1:C2 Reserved. Only write 0s.
C3 Reserved. Write only 1 to this bit.
C4
Selects the ADC reference to be either Internal V
REF
or
V
DD
for analog inputs.
0 = Int V
REF
1 = V
DD
C5:C7 Reserved. Only write 0s.
Interrupt Mask 1 Register (Read/Write) [Address = 1Dh]
This mask register is an 8-bit read/write register that can be
used to mask out any interrupts that can cause the INT/
INT
pin
to go active.
Table 34. Interrupt Mask 1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
Default settings at power-up.
Table 35.
Bit Function
D0 0 = Enable internal T
HIGH
interrupt
1 = Disable internal T
HIGH
interrupt
D1 0 = Enable internal T
LOW
interrupt
1 = Disable internal T
LOW
interrupt
D2 0 = Enable external T
HIGH
interrupt or AIN1 interrupt
1 = Disable external T
HIGH
interrupt or AIN1 interrupt
D3 0 = Enable external T
LOW
interrupt
1 = Disable external T
LOW
interrupt
D4 0 = Enable external temperature fault interrupt
1 = Disable external temperature fault interrupt
D5 0 = Enable AIN2 interrupt
1 = Disable AIN2 interrupt
D6 0 = Enable AIN3 interrupt
1 = Disable AIN3 interrupt
D7 0 = Enable AIN4 interrupt
1 = Disable AIN4 interrupt