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參數資料
型號: ADM1033ARQ-REEL
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: Thermal Monitor and Fan Speed (RPM) Controller
中文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封裝: MO-137AB, QSOP-16
文件頁數: 18/40頁
文件大小: 1164K
代理商: ADM1033ARQ-REEL
ADM1033
ADDITIONAL FUNCTIONS
Several other temperature measurement functions available on
the ADM1033 offer the systems designer added flexibility.
Turn-Off Averaging
The ADM1033 performs averaging at conversion rates of less
than or equal to eight conversions per second. This means that
the value in the measurement register is the average of 16 meas-
urements. For faster measurements, set the conversion rate to 16
conversions per second or greater. (Averaging is not carried out
at these conversion rates.) Or, to switch off averaging at the
slower conversion rates, set Bit 1 (AVG) of Configuration 1
Register (Address 0x01).
Single-Channel ADC Conversions
In normal operating mode, the ADM1033 converts on both the
local temperature and remote channels. However, the user can
set the ADM1033 to convert on one channel only. To enable
single-channel mode, set the round robin bit (Bit 7) in
Configuration Register 2 (Address 0x02) to 0. When the round
robin bit equals 1, the ADM1033 converts on both temperature
channels. In single-channel mode, it converts on one channel
only, to be determined by the state of the channel selector bit
(Bit 4) of Configuration Register 2 (Address 0x02).
Table 11. Channel Selector
Bit 4
Channel Selector (Configuration 2)
0
Local Channel (default)
1
Remote Channel
Rev. 0 | Page 18 of 40
Removing Temperature Errors
As CPUs run faster and faster, it becomes more difficult to avoid
high frequency clocks when routing the D+ and D traces
around a system board. Even when recommended layout
guidelines are followed, temperature errors attributed to noise
coupled onto the D+ and D lines remain. High frequency
noise generally gives temperature measurements that are too
high by a constant amount. The ADM1033 has local and remote
temperature offset registers at Addresses 0x16 and 0x17—one
for each channel. By completing a one-time calibration, the user
can determine the offset caused by the system board noise and
remove it using the offset registers. The registers automatically
add a twos complement word to the remote temperature meas-
urements, ensuring correct readings in the value registers.
Table 12. Offset Registers
Registration
Description
0x16
Local Offset
0x17
Remote Offset
Table 13. Offset Register Values
Code
Offset Value
0 0000 000
0°C (Default)
0 0000 001
0.125°C
0 0000 111
0.875°C
0 0001 111
1.875°C
0 0111 111
7.875°C
0 1111 111
15.875°C
1 0000 000
16°C
1 1111 000
0.875°C
Default
0x00
0x00
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