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參數(shù)資料
| 型號(hào)： | G767 |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | ± 3oC Local / remote temperature sensor with SMBus interface.|Thermal Sensor / Detector Series |
| 中文描述： | ± 3oC本地/ SMBus接口與遠(yuǎn)程溫度傳感器。|熱傳感器/探測(cè)器系列 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 323K |
| 代理商： | G767 |
Ver: 2.4
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
11
G767
Global Mixed-mode Technology Inc.
Table 7. Conversion-Rate Control Byte
DATA
00h
01h
02h
03h
04h
05h
06h
07h
08h to FFh
CONVERSION RATE (Hz)
0.0625
0.125
0.25
0.5
1
2
4
8
RFU
AVERAGE SUPPLY CURRENT (μA TYP, at Vcc = 3.3V)
30
33
35
48
70
128
225
425
-
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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