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SS8018 データシート(PDF) 7 Page - Silicon Standard Corp.

部品番号 SS8018
部品情報  짹1째C Remote and Local Temperature Sensor with SMBus Serial Interface
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メーカー  SSC [Silicon Standard Corp.]
ホームページ  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS8018 データシート(HTML) 7 Page - Silicon Standard Corp.

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SS8018
Low-Power Standby Mode
Standby mode disables the ADC and reduces the sup-
ply-current drain to about 10µA. Enter standby mode by
forcing high to the RUN /STOP bit in the configuration
byte register. Software standby mode behaves such that
all data is retained in memory, and the SMB interface is
alive and listening for reads and writes.
Software standby mode is not a shutdown mode. With
activity on the SMBus, extra supply current is drawn
(see Typical Operating Characteristics). In software
standby mode, the G781 can be forced to perform A/D
conversions via the one-shot command, despite the
RUN
/STOP bit being high. If software standby com-
mand is received while a conversion is in progress, the
conversion cycle is truncated, and the data from that
conversion is not latched into either temperature reading
register. The previous data is not changed and remains
available.
Supply-current drain during the 125ms conversion pe-
riod is always about 320µA. Slowing down the conver-
sion rate reduces the average supply current (see Typi-
cal Operating Characteristics). In between conversions,
the instantaneous supply current is about 25µA due to
the current consumed by the conversion rate timer. In
standby mode, supply current drops to about 3µA. At
very low supply voltages (under the power-on-reset
threshold), the supply current is higher due to the ad-
dress pin bias currents. It can be as high as 100µA, de-
pending on ADD0 and ADD1 settings.
SMBus Digital Interface
From a software perspective, the SS8018 appears as a
set of byte-wide registers that contain temperature data,
alarm threshold values, or control bits, A standard
SMBus 2-wire serial interface is used to read tempera-
ture data and write control bits and alarm threshold data.
Each A/D channel within the device responds to the
same SMBus slave address for normal reads and writes.
The SS8018 employs four standard SMBus protocols:
Write Byte, Read Byte, Send Byte, and Receive Byte
(Figure 3). The shorter Receive Byte protocol allows
quicker transfers, provided that the correct data register
was previously selected by a Read Byte instruction. Use
caution with the shorter protocols in multi-master sys-
tems, since a second master could overwrite the com-
mand byte without informing the first master.
The temperature data format is 11bits plus sign in
twos-complement form for remote channel, with each
data bit representing 0.125°C (Table 2, Table 3), trans-
mitted MSB first.
Table 2. Temperature Data Format
(Two’s-Complement)
DIGITAL OUTPUT
DATA BITS
TEMP.
(°C)
SIGN
MSB
LSB
EXT
+127.875
0
111
1111
111
+126.375
0
111
1110
011
+25.5
0
001
1001
100
+1.75
0
000
0001
110
+0.5
0
000
0000
100
+0.125
0
000
0000
001
-0.125
1
111
1111
111
-1.125
1
111
1110
111
-25.5
1
110
0110
100
-55.25
1
100
1000
110
-65.000
1
011
1111
000
Table 3. Extended Temperature Data Format
EXTENDED
RESOLUTION
DATA BITS
0.000°C
0000 0000
0.125°C
0010 0000
0.250°C
0100 0000
0.375°C
0110 0000
0.500°C
1000 0000
0.625°C
1010 0000
0.750°C
1100 0000
0.875°C
1110 0000
Rev.2.01 6/06/2003


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