AD7418AR Analog Devices Inc, AD7418AR Datasheet - Page 13
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AD7418AR
Manufacturer Part Number
AD7418AR
Description
IC ADC 4CH W/TEMP SENSOR 8-SOIC
Manufacturer
Analog Devices Inc
Datasheet
1.AD7418ARZ.pdf
(24 pages)
Specifications of AD7418AR
Rohs Status
RoHS non-compliant
Function
Temp Monitoring System (Sensor)
Topology
ADC, Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-40°C ~ 125°C
Output Type
I²C™
Output Alarm
No
Output Fan
Yes
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
For Use With
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Table 8. Register Addresses
P2
0
0
0
0
1
1
Temperature Value Register (Address 0x00)
The temperature value register is a 16-bit, read-only register
whose 10 MSBs store the temperature reading from the ADC in
10-bit twos complement format. Bit D5 to Bit D0 are unused.
Table 9. Temperature Value Register
D15
MSB
The temperature data format is shown in Table 10. This shows
the full theoretical range of the ADC from −128°C to +127°C,
but in practice, the temperature measurement range is limited
to the operating temperature range of the device.
Table 10. Temperature Data Format
Temperature
−128°C
−125°C
−100°C
−75°C
−50°C
−25°C
−10°C
−0.25°C
0°C
+0.25°C
+10°C
+25°C
+50°C
+75°C
+100°C
+125°C
+127°C
Configuration Register (Address 0x01)
The configuration register is an 8-bit, read/write register that is
used to set the operating modes of the AD7416/AD7417/AD7418.
Bit D7 to Bit D5 control the channel selection as outlined in
Table 12. Bits[D7:D5] should always be set to 000 for the AD7416.
Bit D4 and Bit D3 are used to set the length of the fault queue.
D2 sets the sense of the OTI output. D1 selects the comparator
or interrupt mode of operation, and D0 = 1 selects the shutdown
mode (default: D0 = 0).
Table 11. Configuration Register
D7
selection
Channel
D6
P1
0
0
1
1
0
0
D14
B8
D5
D13
B7
P0
0
1
0
1
0
1
D4
queue
Fault
D12
B6
Registers
Temperature value
Configuration register
T
T
ADC value (AD7417/AD7418 only)
Config2 (AD7417/AD7418 only)
HYST
OTI
D3
setpoint
setpoint
D11
B5
D2
OTI
polarity
Digital Output
10 0000 0000
10 0000 1100
10 0111 0000
10 1101 0100
11 0011 1000
11 1001 1100
11 1101 1000
11 1111 1111
00 0000 0000
00 0000 0001
00 0010 1000
00 0110 0100
00 1100 1000
01 0010 1100
01 1001 0000
01 1111 0100
01 1111 1100
D10
B4
D1
Cmp/Int
D9
B3
D8
B2
D0
Shutdown
D7
B1
D6
LSB
Rev. I | Page 13 of 24
The AD7416 contains a temperature-only channel; the AD7417
has four analog input channels and a temperature channel; and
the AD7418 has two channels, a temperature channel, and an
analog input channel. The temperature channel address for all
parts is the same, Channel 0. The address for the analog input
channel on the AD7418 is Channel 4. Table 12 outlines the
channel selection on the parts, and Table 13 shows the fault
queue settings. D1 and D2 are explained in the OTI Output
section.
Table 12. Channel Selection
D7
0
0
0
0
1
Table 13. Fault Queue Settings
D4
0
0
1
1
T
The T
nine MSBs store the T
equivalent to the nine MSBs of the temperature value register.
Bit D6 to Bit D0 are unused.
T
The T
nine MSBs store the T
equivalent to the nine MSBs of the temperature value register.
Bit 6 to Bit 0 are unused.
Table 14. T
D15
MSB
ADC Value Register (Address 0x04)
The ADC value register is a 16-bit, read-only register whose
10 MSBs store the value produced by the ADC in binary format.
Bit D5 to Bit D0 are unused. Table 15 shows the ADC value
register with 10 MSBs containing the ADC conversion request.
Table 15. ADC Value Register
D15
MSB
ADC Transfer Function
The designed code transitions occur at successive integer
LSB values (that is, 1 LSB, 2 LSB, and so on). The LSB size =
VREF/1024. The ideal transfer function characteristic for the
AD7417 and AD7418 ADC is shown in Figure 14.
HYST
OTI
Setpoint Register (Address 0x03)
Setpoint Register (Address 0x02)
HYST
OTI
D6
0
0
1
1
0
D14
B8
D14
B7
setpoint register is a 16-bit, read/write register whose
setpoint register is a 16-bit, read/write register whose
D3
0
1
0
1
HYST
D13
B7
D5
0
1
0
1
0
D13
B6
Setpoint and T
D12
B6
Channel Selection
Temperature sensor (all parts), Channel 0
A
A
A
A
Number of Faults
1 (power-up default)
2
4
6
HYST
OTI
IN1
IN2
IN3
IN4
D12
B5
AD7416/AD7417/AD7418
setpoint in twos complement format
(AD7417 only), Channel 1
(AD7417 only), Channel 2
(AD7417 only), Channel 3
(AD7417) and A
setpoint in twos complement format
D11
B5
D11
B4
OTI
Setpoint Registers
D10
B4
D10
B3
IN
(AD7418), Channel 4
D9
B3
D9
B2
D8
B2
D8
B1
D7
B1
D7
LSB
D6
LSB