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參數(shù)資料
| 型號(hào)： | G767F |
| 廠商： | Global Mixed-mode Technology Inc. |
| 元件分類(lèi)： | 溫度/濕度傳感器 |
| 英文描述： | Remote/Local Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠(yuǎn)程/本地溫度傳感器，帶有SMBus串行接口 |
| 文件頁(yè)數(shù)： | 3/14頁(yè) |
| 文件大?。?/td> | 393K |
| 代理商： | G767F |
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Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
11
G767
Global Mixed-mode Technology Inc.
Table 7. Conversion-Rate Control Byte
DATA
CONVERSION RATE (Hz)
AVERAGE SUPPLY CURRENT (A TYP, at Vcc = 3.3V)
00h
0.0625
30
01h
0.125
33
02h
0.25
35
03h
0.5
48
04h
1
70
05h
2
128
06h
4
225
07h
8
425
08h to FFh
RFU
-
Table 8. RLTS and RRTE Temp Register Update Timing Chart
OPERATING MODE
CONVERSION
INITIATED BY:
NEW CONVERSION RATE
(CHANGED VIA WRITE TO WCRW)
TIME UNTIL RLTS AND
RRTE ARE UPDATED
Auto-Convert
Power-on reset
N/A (0.25Hz)
156ms max
Auto-Convert
1-shot command, while idling be-
tween automatic conversions
N/A
156ms max
Auto-Convert
1-shot command that occurs dur-
ing a conversion
N/A
When current conversion is
complete (1-shot is ignored)
Auto-Convert
Rate timer
0.0625Hz
20sec
Auto-Convert
Rate timer
0.125Hz
10sec
Auto-Convert
Rate timer
0.25Hz
5sec
Auto-Convert
Rate timer
0.5Hz
2.5sec
Auto-Convert
Rate timer
1Hz
1.25sec
Auto-Convert
Rate timer
2Hz
625ms
Auto-Convert
Rate timer
4Hz
312.5ms
Auto-Convert
Rate timer
8Hz
237.5ms
Hardware Standby
STBY
pin
N/A
156ms
Software Standby
RUN/STOP bit
N/A
156ms
Software Standby
1-shot command
N/A
156ms
To check for internal bus collisions, read the status
byte. If the least significant seven bits are ones, dis-
card the data and read the status byte again. The
status bits LHIGH, LLOW, RHIGH, and RLOW are
refreshed on the SMBus clock edge immediately fol-
lowing the stop condition, so there is no danger of los-
ing temperature-related status data as a result of an
internal bus collision. The OPEN status bit (diode con-
tinuity fault) is only refreshed at the beginning of a
conversion, so OPEN data is lost. The ALERT in-
terrupt latch is independent of the status byte register,
so no false alerts are generated by an internal bus
collision.
When auto-converting, if the THIGH and TLOW limits
are close together, it’s possible for both high-temp and
low-temp status bits to be set, depending on the
amount of time between status read operations (espe-
cially when converting at the fastest rate). In these
circumstances, it’s best not to rely on the status bits to
indicate reversals in long-term temperature changes
and instead use a current temperature reading to es-
tablish the trend direction.
Conversion Rate Byte
The conversion rate register (Table 7) programs the
time interval between conversions in free-running
auto-convert mode. This variable rate control reduces
the supply current in portable-equipment applications.
The conversion rate byte’s POR state is 02h (0.25Hz).
The G767 looks only at the 3 LSB bits of this register,
so the upper 5 bits are “don’t care” bits, which should
be set to zero. The conversion rate tolerance is
±25%
at any rate setting.
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