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ADT7488A Arkusz danych(PDF) 12 Page - Analog Devices

Numer części ADT7488A
Szczegółowy opis  SST Digital Temperature Sensor and Voltage Monitor
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Strona internetowa  http://www.analog.com
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ADT7488A Arkusz danych(HTML) 12 Page - Analog Devices

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ADT7488A
Rev. 0 | Page 12 of 16
VOLTAGE MEASUREMENT
The ADT7488A has two external voltage measurement channels. It
can also measure its own supply voltage, VCC. Pins 7 and 8
measure the supplies of the processor core voltage (VCCP), and 2.5V
pins, respectively. The VCC supply voltage measurement is carried
out through the VCC pin (Pin 1). The 2.5V pin can be used to
monitor a chipset supply voltage in a computer system.
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive
approximation, analog-to-digital converter (ADC). This has a
resolution of 10 bits. The basic input range is 0 V to 2.25 V, but
the inputs have built-in attenuators to allow measurement of 2.5 V,
3.3 V, 5 V, 12 V, and the processor core voltage (VCCP) without
any external components.
To allow for the tolerance of these supply voltages, the ADC
produces a specific output for each nominal input voltage and
therefore has adequate headroom to cope with overvoltages.
The full-scale voltage that can be recorded for each channel is
shown in Table 10.
Table 10. Maximum Reported Input Voltages
Voltage Channel
Full-Scale Voltage
VCC
4 V
2.5V
4 V
VCCP
4 V
Input Circuitry
The internal structure for the analog inputs is shown in
Figure 15. The input circuit consists of an input protection
diode and an attenuator, plus a capacitor that forms a first-
order, low-pass filter to provide input immunity to high
frequency noise.
35pF
30pF
30pF
MUX
68kΩ
71kΩ
3.3VIN
2.5VIN
VCCP
45kΩ
94kΩ
17.5kΩ
52.5kΩ
Figure 15. Internal Structure of Analog Inputs
Voltage Measurement Command Codes
The voltage measurement command codes are detailed in Table 11.
Each voltage measurement has a read length of two bytes in
little endian format (LSB followed by MSB). All voltages can be
read together by addressing Command Code 0x12 with a read
length of 0x06. The data is retrieved in the order listed in Table 11.
Table 11. Voltage Measurement Command Codes
Voltage Channel
Command Code
Returned Data
VCC
0x12
LSB, MSB
2.5V
0x13
LSB, MSB
VCCP
0x14
LSB, MSB
Voltage Data Format
The returned voltage value is in twos complement, 16-bit,
binary format. The format is structured so that voltages in the
range of ±32 V can be reported. In this way, the reported value
represents the number of 1/1024 V in the actual reading,
allowing a resolution of approximately 1 mV.
Table 12. Analog-to-Digital Output Code vs. VIN
Twos Complement
Voltage
MSB
LSB
3.3
0000 1101
0011 0011
3
0000 1100
0000 0000
2.5
0000 1010
0000 0000
1
0000 0100
0000 0000
0
0000 0000
0000 0000


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