参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 25/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
ADC Information
Round Robin
Table 19. VOLTAGE ATTENUATOR CONFIGURATION
REGISTERS
Both temperature and voltage measurements are analog
inputs that are digitized using the on-board ADC. An
internal multiplexer switches between the different analog
inputs and digitizes them, in turn, in a round-robin manner.
The total conversion time depends upon how the ADT7462
is configured. The conversion times for each measurement
Register Name
Voltage Attenuator
Configuration Register 1
Voltage Attenuator
Configuration Register 2
Register Address
0x18
0x19
channel are shown in Table 18. The complete conversion
time is the sum of the time for the voltage and temperature
measurements.
For example, if the ADT7462 is configured as Easy
Configuration Option 1, the round-robin conversion time is
calculated as follows:
Total Conversion Time =
1 ? (Local Conversion Time) +
3 ? (Remote Conversion Time) +
4 ? (Voltage Measurement Time)
The TACH is not measured using the ADC and so is not
part of the round-robin monitoring cycle.
Table 18. MEASUREMENT CHANNEL CONVERSION
TIMES
Channel Conversion Time (ms)
Single-channel ADC Conversions
Setting Bit 2 of the EDO Enable register (0x16) places the
ADT7462 into single-channel mode. In this mode, the
ADT7462 can be made to convert on a single voltage or
temperature channel only. The channel to be converted on is
selected by writing to Bits [7:3] of the EDO (single-channel)
Enable register (0x16). When the device is in single-channel
mode, the pin configuration option should not be changed.
Note that when the Pin 26 voltage, which includes the
V BATT option, is selected in single-channel mode, this
means that voltage measurements are continuously made in
this mode. If a battery is connected to this input, this results
in an excessive current drain on the battery. The
specification of >10 years of battery life is valid only when
the battery voltage is measured as part of the round robin and
not in single-channel mode.
Local Temperature
9.01
Table 20. SINGLE-CHANNEL MODE OPTIONS
Remote Temperature
Voltage
38.36
8.53
Bits [7:3]
0000 0
ADC Channel Selected
+1.2V2 Voltage, Pin 26
For each ADC temperature and voltage measurement read
from their value registers, 16 readings have actually been
made internally and the results averaged before being placed
in the value register.
Bypass Voltage Attenuators
There are up to 13 voltage measurement channels on the
ADT7462. Each of these voltage measurement channels has
an input structure (see Figure 36 for input structures for each
of the voltage channels). Because the ADC has a voltage
input range from 0 V to 2.25 V, these input circuits attenuate
the voltage input using a resistor divider network to match
the input range of the ADC. However, the user may
occasionally want to remove the attenuators and directly
apply a voltage of between 0 V and 2.25 V to the ADC.
These attenuators can be disabled by setting relevant bits in
the voltage attenuator configuration registers (see Table 19).
This feature also allows the user to rescale the voltage inputs
0000 1
0001 0
0001 1
0010 0
0010 1
0011 0
0011 1
0100 0
0100 1
0101 0
0101 1
0110 0
0110 1
0111 0
1000 0
1000 1
Remote 1 Temperature
Remote 2 Temperature
Remote 3 Temperature
Local Temperature
+12V1 Voltage, Pin 7
+12V2 Voltage, Pin 8
+12V3 Voltage, Pin 22
+3.3V Voltage, Pin 13
+2.5V/+1.8V Voltage, Pin 15
+1.25V/+0.9V Voltage, Pin 19
+5V Voltage, Pin 21
+1.5V/+1.8V/+2.5V Voltage, Pin 23
+1.5V/+1.8V/+2.5V Voltage, Pin 24
+1.2V1/+3.3V Voltage, Pin 25
+1.5V1 Voltage, Pin 28
+1.5V2 Voltage, Pin 29
using an external attenuator circuit. However, when the
attenuators are disabled, the user should ensure that the
voltage on the pin never exceeds 2.25 V.
http://onsemi.com
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