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SS8018 데이터시트(PDF) 10 Page - Silicon Standard Corp.

부품명 SS8018
상세설명  짹1째C Remote and Local Temperature Sensor with SMBus Serial Interface
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS8018
Command Byte Functions
The 8-bit command byte register (Table 5) is the master
index that points to the various other registers within the
SS8018. 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 re-
turns the current local temperature data.
The one-shot command immediately forces a new con-
version 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 automatic
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 success-
ful 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 inter-
nal 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 configuration byte). In
one-shot mode, read the status byte only after the con-
version is complete, which is approximately 125ms max
after the one-shot conversion is commanded.
Table 5. Command-Byte Bit Assignments
REGISTER
COMMAND
POR STATE
FUNCTINON
RLTS
00h
0000 0000*
Read local temperature. It returns latest temperature
RRTE
01h
0000 0000*
Read remote temperature. It returns latest temperature
RSL
02h
N/A
Read status byte (flags, busy signal)
RCL
03h
0000 0000
Read configuration byte
RCRA
04h
0000 1000
Read conversion rate byte
RLHN
05h
0101 0101 (85)
Read local THIGH limit
RLLI
06h
0000 0000
Read local TLOW limit
RRHI
07h
0101 0101 (85)
Read remote THIGH limit
RRLS
08h
0000 0000
Read remote TLOW limit
WCA
09h
N/A
Write configuration byte
WCRW
0Ah
N/A
Write conversion rate byte
WLHO
0Bh
N/A
Write local THIGH limit
WLLM
0Ch
N/A
Write local TLOW limit
WRHA
0Dh
N/A
Write remote THIGH limit
WRLN
0Eh
N/A
Write remote TLOW limit
OSHT
0Fh
N/A
One-shot command (use send-byte format)
RTEXT
10h
0
Remote temperature extended byte
RTOFS
11h
0
Remote temperature offset high byte
RTOFSEXT
12h
0
Remote temperature offset extended byte
RLEXT
13h
0
Remote THIGH limit extended byte
RHEXT
14h
0
Remote TLOW limit extended byte
RTTHERM
19h
0101 0101 (85)
Remote temperature
THERM limit
LTTHERM
20h
0101 0101 (85)
Local temperature
THERM limit
THERMHYST
21h
0000 1010 (10)
THERM hysteresis
ALERTFQ
22h
0
ALERT
fault queue code
MFGIO
FEh
0100 0111
Manufacturer ID
DEVID
FFh
0000 0001
Device ID
*If the device is in standby mode at POR, both temperature registers read 0
°C.
Rev.2.01 6/06/2003


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