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MAX6692YMUA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6692YMUA Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 16 page  nel. If the remote-diode channel is unused, connect DXP to DXN rather than leaving the pins open. The DXN input is biased to one VBE above ground by an internal diode to prepare the ADC inputs for a differ- ential measurement. The worst-case DXP-DXN differen- tial input voltage range is 0.25V to 0.95V. Excess resistance in series with the remote diode causes +0.5°C (typ) error per ohm. A/D Conversion Sequence A conversion sequence consists of a local temperature measurement and a remote temperature measurement. Each time a conversion begins, whether initiated auto- matically in the free-running autonomous mode (RUN = 0) or by writing a one-shot command, both channels are converted, and the results of both measurements are available after the end of a conversion. A BUSY status bit in the status byte indicates that the device is performing a new conversion. The results of the previous conversion are always available, even if the ADC is busy. Low-Power Standby Mode Standby mode reduces the supply current to less than 10µA by disabling the ADC and timing circuitry. Enter standby mode by setting the RUN bit to 1 in the configu- ration byte register (Table 6). All data is retained in mem- ory, and the SMBus interface is active and listening for SMBus commands. Standby mode is not a shutdown mode. With activity on the SMBus, the device draws more supply current (see Typical Operating Characteristics). In standby mode, the MAX6648/MAX6692 can be forced to perform A/D conversions through the one-shot command, regardless of the RUN bit status. If a standby command is received while a conversion is in progress, the conversion cycle is truncated, and the data from that conversion is not latched into a tempera- ture register. The previous data is not changed and remains available. Supply-current drain during the 125ms conversion peri- od is 500µA (typ). Slowing down the conversion rate reduces the average supply current (see Typical Operating Characteristics). Between conversions, the conversion rate timer consumes about 25µA of supply current. In standby mode, supply current drops to about 3µA. SMBus Digital Interface From a software perspective, the MAX6648/MAX6692 appear as a set of byte-wide registers that contain tem- perature data, alarm threshold values, and control bits. A standard SMBus-compatible 2-wire serial interface is used to read temperature data and write control bits and alarm threshold data. These devices respond to the same SMBus slave address for access to all functions. The MAX6648/MAX6692 employ four standard SMBus protocols: write byte, read byte, send byte, and receive byte (Figures 1, 2, and 3). The shorter receive byte proto- col allows quicker transfers, provided that the correct data register was previously selected by a read byte instruction. Use caution when using the shorter protocols in multimaster systems, as a second master could over- write the command byte without informing the first master. Temperature data can be read from the read internal temperature (00h) and read external temperature (01h) registers. The temperature data format for these regis- ters is 7 bits plus 1 bit, indicating the diode fault status for each channel, with the LSB representing 1°C (Table 1). The MSB is transmitted first. An additional 3 bits can be read from the read external extended temperature register (10h), which extends the data to 10 bits plus sign and the resolution to 0.125°C per LSB (Table 2). An additional 3 bits can be read from the read internal extended temperature register (11h), which extends the data to 10 bits (plus 1 bit indi- cating the diode fault status) and the resolution to 0.125°C per LSB (Table 2). When a conversion is complete, the main temperature register and the extended temperature register are updated simultaneously. Ensure that no conversions are completed between reading the main register and the extended register, so that both registers contain the result of the same conversion. To ensure valid extended data, read extended resolu- tion temperature data using one of the following approaches: 1) Put the MAX6648/MAX6692 into standby mode by setting bit 6 of the configuration register to 1. Initiate a one-shot conversion using command byte 0Fh. When this conversion is complete, read the contents of the temperature data registers. Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms 6 _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _ FRACTIONAL TEMP (°C) DIGITAL OUTPUT 0.000 000X XXXX 0.125 001X XXXX 0.250 010X XXXX 0.375 011X XXXX 0.500 100X XXXX 0.625 101X XXXX 0.750 110X XXXX 0.875 111X XXXX Table 2. Extended Resolution Temperature Register Data Format (10h, 11h) |
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