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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 11/14頁(yè) |
| 文件大小： | 342K |
| 代理商： | G781 |
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Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
11
Global Mixed-mode Technology Inc.
G781
Table 6. Configuration-Byte Bit Assignments
BIT
7 (MSB)
NAME
MASK
POR STATE
0
FUNCTION
Masks all
ALERT
interrupts when high.
6
RUN
/
STOP
RFU
0
Standby mode control bit. If high, the device immediately stops converting and en-
ters standby mode. If low, the device converts in either one-shot or timer mode.
5-0
0
Reserved for future use
Table 7. Status-Byte Bit Assignments
BIT
7 (MSB)
6
5
4
3
2
1
NAME
BUSY
LHIGH*
LLOW*
RHIGH*
RLOW*
OPEN*
RTHRM
FUNCTION
A high indicates that the ADC is busy converting.
A high indicates that the local high-temperature alarm has activated.
A high indicates that the local low-temperature alarm has activated.
A high indicates that the remote high-temperature alarm has activated.
A high indicates that the remote low-temperature alarm has activated.
A high indicates a remote-diode continuity (open-circuit) fault.
A high indicates a remote temperature
THERM
alarm has activated.
0 (LSB)
LTHRM
A high indicates a local temperature
THERM
alarm has activated.
*These flags stay high until cleared by POR, or until the status byte register is read.
Table 8. Conversion-Rate Control Byte
DATA
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h to FFh
CONVERSION RATE (Hz)
0.0625
0.125
0.25
0.5
1
2
4
8
16
RFU
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
inter-
rupt latch is independent of the status byte register, so
no false alerts are generated by an internal bus colli-
sion.
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.
For bit 1 and bit 0, a high indicates a temperature
alarm happened for remote and local diode respec-
tively.
THERM
pin also asserts. These two bits
wouldn’t be cleared when reading status byte.
Conversion Rate Byte
The conversion rate register (Table 8) 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 08h (16Hz).
The G781 looks only at the 4 LSB bits of this register,
so the upper 4 bits are “don’t care” bits, which should
be set to zero. The conversion rate tolerance is
±
25%
at any rate setting.
Valid A/D conversion results for both channels are
available one total conversion time (125ms,typical)
after initiating a conversion, whether conversion is
initiated via the
RUN
/STOP bit, one-shot command,
or initial power-up.
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