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SS8018 データシート(PDF) 7 Page - Silicon Standard Corp. |
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SS8018 データシート(HTML) 7 Page - Silicon Standard Corp. |
7 / 14 page www.SiliconStandard.com 7 of 14 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 |
同様の部品番号 - SS8018 |
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同様の説明 - SS8018 |
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