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參數(shù)資料
| 型號： | G781 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【1∑C Remote and Local Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 【1ΣC遠(yuǎn)程和本地溫度傳感器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 342K |
| 代理商： | G781 |
Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
12
Global Mixed-mode Technology Inc.
G781
POR AND UVLO
The G781 has a volatile memory. To prevent ambiguous
power-supply conditions from corrupting the data in
memory and causing erratic behavior, a POR voltage
detector monitors VCC and clears the memory if VCC
falls below 1.7V (typical, see Electrical Characteristics
table). When power is first applied and VCC rises above
1.7V (typical), the logic blocks begin operating, although
reads and writes at V
CC
levels below 3V are not recom-
mended. A second VCC comparator, the ADC UVLO
comparator, prevents the ADC from converting until there
is sufficient headroom (VCC= 2.8V typical).
ALERT Fault Queue
To suppress unwanted
ALERT
triggering the G781 em-
bedded a fault queue function. The
ALERT
won’t as-
sert until consecutive out of limit measurements have
reached the queue number. The mapping of fault
queue register (ALERTFQ, 22h) value to fault queue
number is shown in the Table 9.
Table 9. Alert Fault Queue
ALERTFQ
VALUE
XXXX000X
XXXX001X
XXXX010X
XXXX011X
XXXX100X
XXXX101X
XXXX110X
XXXX111X
FAULT QUEUE NUMBER
1
2
3
3
4
4
4
4
Operation of TheTHERMFunction
A local and remote
THERM
limit can be programmed
into the G781 to set the temperature limit above which
the
THERM
pin asserts low and the bit 1, of status
byte will be set to 1 corresponding to remote and local
over temperature. These two bits won’t be cleared to 0
by reading status byte it the over temperature condi-
tion remain. A hysteresis value is provided by writing
the register 21h to set the temperature threshold to
release the
THERM
pin alarm state, The releasing
temperature is the value of register 19h, 20h minus the
value in register 21h. The format of register 21h is 2’s
complement. The
THERM
signal is open drain and
requires a pull-up resistor to power supply.
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