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参数资料
| 型号： | G767F |
| 厂商： | Global Mixed-mode Technology Inc. |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | Remote/Local Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 远程/本地温度传感器，带有SMBus串行接口 |
| 文件页数： | 14/14页 |
| 文件大小： | 393K |
| 代理商： | G767F |
Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
9
G767
Global Mixed-mode Technology Inc.
If the remote channel is shorted (DXP to DXN or DXP
to GND), the ADC reads 0000 0000 so as not to trip
either the THIGH or TLOW alarms at their POR settings.
In applications that are never subjected to 0
°C in nor-
mal operation, a 0000 0000 result can be checked to
indicate a fault condition in which DXP is accidentally
short circuited. Similarly, if DXP is short circuited to
VCC, the ADC reads +127°C for both remote and local
channels, and the device alarms.
Table 3. Read Format for Alert Response Address
(0001 100)
BIT
NAME
FUNCTION
7(MSB)
ADD7
6
ADD6
5
ADD5
4
ADD4
3
ADD3
2
ADD2
1
ADD1
Provide the current G767
slave address that was
latched at POR (Table 8)
0(LSB)
1
Logic 1
ALERT
Interrupts
The ALERT interrupt output signal is latched and
can only be cleared by reading the Alert Response
address. Interrupts are generated in response to THIGH
and TLOW comparisons and when the remote diode is
disconnected (for continuity fault detection). The inter-
rupt does not halt automatic conversions; new tem-
perature data continues to be available over the
SMBus interface after ALERT is asserted. The in-
terrupt output pin is open-drain so that devices can
share a common interrupt line. The interrupt rate can
never exceed the conversion rate.
The interface responds to the SMBus Alert Response
address, an interrupt pointer return-address feature
(see Alert Response Address section). Prior to taking
corrective action, always check to ensure that an in-
terrupt is valid by reading the current temperature.
Alert Response Address
The SMBus Alert Response interrupt pointer provides
quick fault identification for simple slave devices that
lack the complex, expensive logic needed to be a bus
master. Upon receiving an ALERT interrupt signal,
the host master can broadcast a Receive Byte trans-
mission to the Alert Response slave address (0001
100). Then any slave device that generated an inter-
rupt attempts to identify itself by putting its own ad-
dress on the bus (Table 3).
Table 4. Command-Byte Bit Assignments
REGISTER
COMMAND
POR STATE
FUNCTINON
RLTS
00h
0000 0000*
Read local temperature: returns latest temperature
RRTE
01h
0000 0000*
Read remote temperature: returns latest temperature
RSL
02h
N/A
Read status byte (flags, busy signal)
RCL
03h
0000 0000
Read configuration byte
RCRA
04h
0000 0010
Read conversion rate byte
RLHN
05h
0111 1111
Read local THIGH limit
RLLI
06h
1100 1001
Read local TLOW limit
RRHI
07h
0111 1111
Read remote THIGH limit
RRLS
08h
1100 1001
Read remote TLOW limit
WCA
09h
N/A
Write configuration byte
WCRW
0Ah
N/A
Write conversion rate byte
WLHO
0Bh
N/A
Write local THIGH limit
WLLM
0Ch
N/A
Write local TLOW limit
WRHA
0Dh
N/A
Write remote THIGH limit
WRLN
0Eh
N/A
Write remote TLOW limit
OSHT
0Fh
N/A
One-shot command (use send-byte format)
*If the device is in hardware standby mode at POR, both temperature registers read 0
°C.
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