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ADT7490
output of ON Semiconductor’s VR11.1 controllers. I MON is
a voltage representation of the CPU current.
Table 8. VOLTAG E MEASUREMENT REGISTERS
Register Description Default
Analog-to-Digital Converter
All analog inputs are multiplexed into the on-chip,
successive approximation, analog-to-digital converter. This
ADC 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, 5.0 V, 12 V, and the processor
core voltage V CCP without any external components. To
allow the tolerance of these supply voltages, the ADC
produces an output of 3/4 full scale (768 decimal or
0x1D
0x1E
0x20
0x21
0x22
0x23
0x24
I MON Reading
V TT Reading
+2.5 V IN Reading
V CCP Reading
V CC Reading
+5 V IN Reading
+12 V IN Reading
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x300 hexadecimal) for the nominal input voltage, and
therefore, has adequate headroom to cope with
overvoltages.
Input Circuitry
The internal structure for the analog inputs is shown in
Figure 24 . The input circuit consists of an input protection
Voltage Limit Registers
Associated with each voltage measurement channel is a
high and low limit register. Exceeding the programmed high
or low limit causes the appropriate status b it to be set.
Exceeding either limit can also generate SMBALERT
interrupts.
diode, an attenuator, plus a capacitor to form a first-order
low-pass filter that gives input immunity to high frequency
noise.
120 k W
+12V IN
20 k W 30 pF
Table 9. VOLTAGE LIMIT REGISTERS
Register Description
0x85 I MON Low Limit
0x87 I MON High Limit
0x84 V TT Low Limit
0x86 V TT High Limit
Default
0x00
0xFF
0x00
0xFF
+5V IN
93 k W
0x44
0x45
+2.5 V IN Low Limit
+2.5 V IN High Limit
0x00
0xFF
47 k W
30 pF
0x46
V CCP Low Limit
0x00
V CC
68 k W
71 k W
30 pF
0x47
0x48
0x49
0x4A
V CCP High Limit
V CC Low Limit
V CC High Limit
+5.0 V IN Low Limit
0xFF
0x00
0xFF
0x00
+2.5V IN
45 k W
94 k W
30 pF
MUX
0x4B
0x4C
0x4D
+5.0 V IN High Limit
+12 V IN Low Limit
+12 V IN High Limit
0xFF
0x00
0xFF
V CCP
I MON
17.5 k W
52.5 k W
45 k W
94 k W
35 pF
30 pF
When the ADC is running, it samples and converts a
voltage input in 0.7 ms and averages 16 conversions to
reduce noise; a measurement takes nominally 11 ms.
Extended Resolution Registers
Voltage measurements can be made with higher accuracy
using the extended resolution registers (0x1F, 0x76, and
0x77). Whenever the extended resolution registers are read,
the corresponding data in the voltage measurement registers
V TT
45 k W
(0x1D, 0x1E, and 0x20 to 0x24) is locked until their data is
read. That is, if extended resolution is required, the extended
45 k W
30 pF
resolution register must be read first, immediately followed
by the appropriate voltage measurement register.
Figure 24. Analog Inputs Structure
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