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參數(shù)資料
| 型號(hào)： | G771 |
| 廠商： | Global Mixed-mode Technology Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit |
| 中文描述： | 兩個(gè)遠(yuǎn)程溫度傳感器，帶有SMBus串行接口和系統(tǒng)復(fù)位電路 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 268K |
| 代理商： | G771 |
Ver: 0.2 Preliminary
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
11
G771
Global Mixed-mode Technology Inc.
Configuration Byte Functions
The configuration byte register contents are listed in
table 5. Bit 7 (MASK) is used to mask
ALERT inter-
rupt. Bit 6 ( RUN /STOP) is to put the device in software
standby mode. Setting bit 5 (DET_FAN) with logic 1
can activate the detection of fan failure. Logic 1 in bit 4
(EN_TH_SHUT) makes thermal shutdown function
valid and logic 0 disables this function and keep
TH_SHUT pin low. Bit 3~0 forms thermal shutdown
fault queue. The number of faults these bits decided
are listed in table 6.
Thermal Status Byte Functions
The thermal status byte register (02h) (Table 6) indi-
cates which (if any) temperature thresholds have been
exceeded. This byte also indicates whether or not the
ADC is converting and whether there is an open circuit
in the remote diode DXPx-DXN path. After POR, the
normal state of all the flag bits is zero, assuming none
of the alarm conditions are present. The status byte is
cleared by any successful read of the status, unless
the fault persists. Note that the ALERT interrupt latch
is not automatically cleared when the status flag bit is
cleared.
When reading the status byte, you must check for in-
ternal bus collisions caused by asynchronous ADC
timing, or else disable the ADC prior to reading the
status byte (via the RUN /STOP bit in the configura-
tion byte). In one-shot mode, read the status byte only
after the conversion is complete, which is 150ms max
after the one-shot conversion is commanded.
Table 5. Configuration-Byte Bit Assignments
BIT
NAME
POR STATE
FUNCTION
7 (MSB)
MASK
0
Masks all ALERT interrupts when high.
6
RUN
/ STOP
0
Standby mode control bit. If high, the device immediately stops converting and en-
ters standby mode. If low, the device converts in either one-shot or timer mode.
5
DET_FAN
0
Should be 0. Changing this to 1 will cause ALERT function abnormal.
4
EN_TH_SHUT
1
Validation of the fault queue function of thermal shutdown.
3-0
FQ_TH_SHUT
0010b
Fault Queue. Number of faults necessary to detect before setting TH_SHUT output
to avoid false tripping due to noise.
Table 6. Number of Faults assigned by FQ_TH_SHUT
FQ_TH_SHUT
Number of Faults
FQ_TH_SHUT
Number of Faults
0000b
1
1000b
9
0001b
2
1001b
10
0010b
3(Power-up default)
1010b
11
0011b
4
1011b
12
0100b
5
1100b
13
0101b
6
1101b
14
0110b
7
1110b
15
0111b
8
1111b
16
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