ADT7476 Analog Devices, Inc., ADT7476 Datasheet - Page 18

• Manufacturer Part Number: ADT7476
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

ADT7476
Table 6. Conversion Time with Averaging Disabled
Channel
Voltage Channels
Remote Temperature 1
Remote Temperature 2
Local Temperature
When Bit 7 of Configuration Register 6 (0x10) is set, the default
round-robin cycle time increases to 240 ms.
Bypass All Voltage Input Attenuators
Setting Bit 5 of Configuration Register 2 (0x73) removes the
attenuation circuitry from the 2.5 V, V
inputs. This allows the user to directly connect external sensors
or rescale the analog voltage measurement inputs for other
applications. The input range of the ADC without the attenua-
tors is 0 V to 2.25 V.
Bypass Individual Voltage Input Attenuators
Bits [7:4] of Configuration Register 4 (0x7D) can be used to
bypass individual voltage channel attenuators.
Table 7. Bypassing Individual Voltage Input Attenuators
Using Configuration Register 4 (0x7D)
Bit
4
5
6
7
Channel Attenuated
Bypass 2.5 V attenuator
Bypass V
Bypass 5 V attenuator
Bypass 12 V attenuator
CCP
attenuator
Measurement Time (ms)
0.7
7
7
1.3
CCP
, V
CC
, 5 V, and 12 V
Rev. B | Page 18 of 72
Configuration Register 2 (0x73)
Bit 4 = 1, averaging off.
Bit 5 = 1, bypass input attenuators.
Bit 6 = 1, single-channel convert mode.
TACH1 Minimum High Byte Register (0x55)
Bits [7:5] select ADC channel for single-channel convert mode.
Single-Channel ADC Conversion
While single-channel mode is intended as a test mode that can
be used to increase sampling times for a specific channel,
therefore helping to analyze that channel’s performance in
greater detail, it can also have other applications.
Setting Bit 6 of Configuration Register 2 (0x73) places the
ADT7476 into single-channel ADC conversion mode. In this
mode, the ADT7476 can read a single voltage channel only. The
selected voltage input is read every 0.7 ms. The appropriate
ADC channel is selected by writing to Bits [7:5] of the TACH1
minimum high byte register (0x55).
Table 8. Programming Single-Channel ADC Mode
Register 0x55, Bits [7:5]
000
001
010
011
100
101
110
111
1
.
TACH1 minimum high byte is also changed, possibly trading off TACH1
minimum high byte functionality with single-channel mode functionality.
In the process of configuring single-channel ADC conversion mode, the
Channel Selected
2.5 V
V
V
5 V
12 V
Remote 1 temperature
Local temperature
Remote 2 temperature
CCP
CC
1