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ADT7473
Input Circuitry
The internal structure for the V CCP analog input is shown
in Figure 23. The input circuit consists of an input protection
diode, an attenuator, plus a capacitor to form a first order
low-pass filter that provides the input immunity to high
frequency noise.
17.5 k W
V CCP
52.5 k W 35 pF
Figure 23. Structure of Analog Inputs
Table 9. VOLTAG E MEASUREMENT REGISTERS
Register Description Default
0x21 V CCP Reading 0x00
results averaged before being placed into the value register.
When faster conversions are needed, setting Bit 4 of
Configuration Register 2 (0x73) turns averaging off. This
effectively gives a reading 16 times faster (711 m s), but the
reading may be noisier.
Bypass Voltage Input Attenuator
Setting Bit 5 of Configuration Register 2 (0x73) removes
the attenuation circuitry from the V CCP input. This allows
the user to directly connect external sensors or to rescale the
analog voltage measurement inputs for other applications.
The input range of the ADC without the attenuators is 0 V
to 2.25 V.
Single-channel ADC Conversion
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7473/ADT7473 ? 1 into single-channel ADC
conversion mode. In this mode, the ADT7473/ADT7473 ? 1
0x22
V CCP Reading
0x00
can be made to read a single voltage channel only. If the
V CCP Limit Registers
Associated with the V CCP measurement channel is a high
and low limit register. Exceeding the programmed high or
low limit causes the appropriate status bit to be set.
Exceeding either limit can also generate SMBALERT
interrupts.
internal ADT7473/ADT7473 ? 1 clock is used, the selected
input is read every 711 m s. The appropriate ADC channel is
selected by writing to Bits <7:5> of the TACH1 minimum
high byte register (0x55).
Table 11. PROGRAMMING SINGLE-CHANNEL
ADC MODE
Table 10. V CCP LIMIT REGISTERS
Register Description
0x46 V CCP Low Limit
0x47 V CCP High Limit
Default
0x00
0xFF
Bits <7:5>, Register 0x55
001
010
101
110
Channel Selected
V CCP
V CC
Remote 1 Temperature
Local Temperature
Table 13 shows the input ranges of the analog inputs and
output codes of the 10-bit ADC.
111
Remote 2 Temperature
When the ADC is running, it samples and converts a
voltage input in 711 m s and averages 16 conversions to
reduce noise; a measurement takes nominally 11.38 ms.
Table 12. C ONFIGURATION              REGISTER 2 (REG. 0X73)
Bit Description
<4> 1: Averaging Off
Additional ADC Functions for Voltage Measurements
A number of other functions are available on the
ADT7473/ADT7473 ? 1 to offer the system designer
<5>
<6>
1: Bypass Input Attenuators
1: Single-channel Convert Mode
increased flexibility.
Turn-off Averaging
For each voltage measurement read from a value register,
TACH1 Minimum High Byte Register (0x55)
Bits <7:5> select ADC channel for single-channel convert
mode.
16 readings have actually been made internally and the
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