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參數(shù)資料
| 型號： | G767F |
| 廠商： | Global Mixed-mode Technology Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Remote/Local Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠程/本地溫度傳感器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 393K |
| 代理商： | G767F |
Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G767
Global Mixed-mode Technology Inc.
Write Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
8 bits
1
Slave Address: equivalent to chip- select line of a 3-wire interface
Command Byte: selects which register you are writing to
Data byte: data goes into the register set by the command byte (to set thresholds, configuration masks, and sam
pling rate)
Read Byte Format
S
ADDRESS WR
ACK
COMMAND
ACK
S
ADDRESS RD
ACK
DATA
///
P
7 bits
8bits
7bits
8 bits
Slave Address: equivalent to chip- select line
Command Byte: selects which register you are reading from
Slave Address: repeated due to change in data-flow direction
Data byte: reads from the register set by the command byte
Send Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
P
7 bits
8 bits
Command Byte: sends command with no data , usually used for one-shot command
Receive Byte Format
S
ADDRESS
RD
ACK
DATA
///
P
7 bits
8 bits
Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission; also used
for SMBus Alert Response return address
S = Start condition Shaded = Slave transmission P = Stop condition /// = Not acknowledged
Figure 3. SMBus Protocols
Table 2. Data Format (Twos-Complement)
DIGITAL OUTPUT
DATA BITS
TEMP.
(°C)
ROUND
TEMP.
(°C)
SIGN
MSB
LSB
+130.00
+127
0
111
1111
+127.00
+127
0
111
1111
+126.50
+127
0
111
1111
+126.00
+126
0
111
1110
+25.25
+25
0
001
1001
+0.50
+1
0
000
0001
+0.25
+0
0
000
0000
+0.00
+0
0
000
0000
-0.25
+0
0
000
0000
-0.50
+0
0
000
0000
-0.75
-1
1
111
1111
-1.00
-1
1
111
1111
-25.00
-25
1
110
0111
-25.50
-25
1
110
0110
-54.75
-55
1
100
1001
-55.00
-55
1
100
1001
-65.00
-65
1
011
1111
-70.00
-65
1
011
1111
Alarm Threshold Registers
Four registers store alarm threshold data, with
high-temperature (THIGH) and low-temperature (TLOW)
registers for each A/D channel. If either measured
temperature equals or exceeds the corresponding
alarm threshold value, an ALERT interrupt is as-
serted.
The power-on-reset (POR) state of both THIGH registers
is full scale (0111 1111, or +127
°C). The POR state of
both TLOW registers is 1100 1001 or -55°C.
Diode Fault Alarm
There is a continuity fault detector at DXP that detects
whether the remote diode has an open-circuit condi-
tion. At the beginning of each conversion, the diode
fault is checked, and the status byte is updated. This
fault detector is a simple voltage detector; if DXP rises
above VCC – 1V (typical) due to the diode current
source, a fault is detected. Note that the diode fault
isn’t checked until a conversion is initiated, so immedi-
ately after power-on reset the status byte indicates no
fault is present, even if the diode path is broken.
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