SS8018TR SSC [Silicon Standard Corp.], SS8018TR Datasheet - Page 10

• Manufacturer Part Number: SS8018TR
• Manufacturer: SSC [Silicon Standard Corp.]

Rev.2.01 6/06/2003
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.
(
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 (
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.
Table 5. Command-Byte Bit Assignments
*If the device is in standby mode at POR, both temperature registers read 0 C.
THERMHYST
RUN
REGISTER
RTOFSEXT
RTTHERM
LTTHERM
ALERTFQ
WCRW
RTOFS
RHEXT
RTEXT
RLEXT
MFGIO
WRHA
DEVID
WLHO
WRLN
RCRA
WLLM
OSHT
RRTE
RLHN
RRLS
RLTS
RRHI
WCA
RLLI
RSL
RCL
/STOP bit = high), a new conversion is begun,
COMMAND
0Ah
0Bh
0Ch
0Dh
0Eh
FEh
FFh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
10h
11h
12h
13h
14h
19h
20h
21h
22h
In software standby mode
RUN
0101 0101 (85)
0101 0101 (85)
0000 1010 (10)
POR STATE
0000 0000*
0000 0000*
0101 0101 (85) Read local T
0101 0101 (85) Read remote T
0000 0000
0000 1000
0000 0000
0000 0000
0100 0111
0000 0001
/STOP bit = low)
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N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0
0
0
0
0
0
Manufacturer ID
Device ID
Write configuration byte
Write conversion rate byte
Write local T
Write local T
Write remote T
Write remote T
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
Read local T
Read remote T
One-shot command (use send-byte format)
Remote temperature extended byte
Remote temperature offset high byte
Remote temperature offset extended byte
Remote T
Remote T
Remote temperature THERM limit
Local temperature THERM limit
THERM hysteresis
ALERT fault queue code
HIGH
LOW
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
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
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.
HIGH
LOW
HIGH
LOW
limit extended byte
limit extended byte
HIGH
LOW
HIGH
LOW
ALERT
limit
limit
limit
limit
limit
limit
limit
limit
RUN
interrupt latch is not automatically cleared
FUNCTINON
/STOP bit in the configuration byte). In
SS8018
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