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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 342K |
| 代理商： | G781 |
Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
10
Global Mixed-mode Technology Inc.
G781
Command Byte Functions
The 8-bit command byte register (Table 5) is the mas-
ter index that points to the various other registers
within the G781. The register’s POR state is 0000
0000, so that a Receive Byte transmission (a protocol
that lacks the command byte) that occurs immediately
after POR returns the current local temperature data.
The one-shot command immediately forces a new
conversion cycle to begin. In software standby mode
(
RUN
/STOP bit = high), a new conversion is begun,
after which the device returns to standby mode. If a
conversion is in progress when a one-shot command
is received in auto-convert mode (
RUN
/STOP bit =
low) between conversions, a new conversion begins,
the conversion rate timer is reset, and the next auto-
matic conversion takes place after a full delay elapses.
Configuration Byte Functions
The configuration byte register (Table 6) is used to
mask interrupts and to put the device in software
standby mode. The other bits are empty.
Status Byte Functions
The status byte register (Table 7) indicates which (if
any) temperature thresholds have been exceeded.
This byte also indicates whether or not the ADC is
converting and whether there is an open circuit in the
remote diode DXP-DXN path. After POR, the normal
state of all the flag bits is zero, assuming none of the
alarm conditions are present. The status byte is
cleared by any successful read of the status, unless
the fault persists. Note that the
ALERT
interrupt latch
is not automatically cleared when the status flag bit is
cleared.
When reading the status byte, you must check for in-
ternal bus collisions caused by asynchronous ADC
timing, or else disable the ADC prior to reading the
status byte (via the
RUN
/STOP bit in the configura-
tion byte). In one-shot mode, read the status byte only
after the conversion is complete, which is approxi-
mately 125ms max after the one-shot conversion is
commanded.
Table 5. Command-Byte Bit Assignments
REGISTER
RLTS
RRTE
RSL
RCL
RCRA
RLHN
RLLI
RRHI
RRLS
WCA
WCRW
WLHO
WLLM
WRHA
WRLN
OSHT
RTEXT
RTOFS
RTOFSEXT
RLEXT
RHEXT
RTTHERM
COMMAND
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
19h
POR STATE
0000 0000*
0000 0000*
N/A
0000 0000
0000 1000
0101 0101 (85) Read local T
HIGH
limit
0000 0000
Read local T
LOW
limit
0101 0101 (85) Read remote T
HIGH
limit
0000 0000
Read remote T
LOW
limit
N/A
Write configuration byte
N/A
Write conversion rate byte
N/A
Write local T
HIGH
limit
N/A
Write local T
LOW
limit
N/A
Write remote T
HIGH
limit
N/A
Write remote T
LOW
limit
N/A
One-shot command (use send-byte format)
0
Remote temperature extended byte
0
Remote temperature offset high byte
0
Remote temperature offset extended byte
0
Remote T
HIGH
limit extended byte
0
Remote T
LOW
limit extended byte
0101 0101 (85)
Remote temperature THERM limit
0101 0101 (85)
Local temperature THERM limit
0000 1010 (10)
THERM hysteresis
0
ALERT
fault queue code
0100 0111
Manufacturer ID
0000 0001
Device ID
FUNCTINON
Read local temperature. It returns latest temperature
Read remote temperature. It returns latest temperature
Read status byte (flags, busy signal)
Read configuration byte
Read conversion rate byte
LTTHERM
THERMHYST
20h
21h
ALERTFQ
MFGIO
DEVID
*If the device is in standby mode at POR, both temperature registers read 0
°
C.
22h
FEh
FFh
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