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參數(shù)資料
| 型號： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 52/88頁 |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 56 of 88 | www.onsemi.com
THERM TIMER
The ADT7462 can also measure assertion times on the THERM
inputs as a percentage of a timer window. The timer window for
the THERM1 input is programmed using Bits [4:2] of the
THERM configuration register (0x0D). The timer window for
the THERM2 input is programmed using Bits [7:5] of the THERM
configuration register (0x0D). Values from 0.25 sec to 8 sec are
programmable (see Table 31).
Table 31. THERM Timer Window
Code
THERM Timer Window
000
0.25 sec
001
0.5 sec
010
1 sec
011
2 sec
100
4 sec
101
8 sec
110
8 sec
111
8 sec
The assertion time as a percentage of the timer window is
stored in the THERM % on-time registers. This is a cumulative
sum of the percentage of time during the THERM timer win-
dow that THERM is asserted. The % on-time and associated
timer limit registers are listed in Table 32.
Table 32. THERM On-Time and Timer Limit Register
Channel
% On-Time Register
% Timer Limit Register
THERM1
0xAE
0x80
THERM2
0xAF
0x81
When the measured percentage exceeds the corresponding per-
centage limit, the T1% bit in Host Thermal Status Register 2
(0xB9) is asserted, and an ALERT is generated (that is, if the
mask bit is not set). If the limit is set to 0x00, an ALERT is
generated on the first assertion. If the limit is set to 0xFF, an
ALERT is never generated because 0xFF corresponds to the
THERM input being asserted all the time.
When THERM is configured as an input only, setting Bits [4:1]
of the THERM zone in the THERM1 configuration register
(0x0E) and the THERM2 configuration register (0x0F) allows
Pin 28/Pin 29 to operate as an I/O.
THERM Timer Limit Register
The THERM timer limit is programmed to Register 0x80 and
Register 0x81. If THERM is asserted for longer than the
programmed percentage limit, then an ALERT is generated.
The limit is programmed as a percentage of the chosen THERM
timer window.
Example
The THERM timer window is eight seconds, and an ALERT
should be generated if THERM is asserted for more than one
second.
%
5
.
12
100
8
1
%
=
×
=
Limit
The THERM timer limit register is an 8-bit register.
0x00 = 0%; 0xFF = 100%
Therefore, 1 LSB = 0.39%
00100000
20
x
0
decimal
32
%
39
.
0
%
5
.
12
=
When the time window has elapsed, if the THERM limit has
been exceeded, then an ALERT is generated.
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