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MAX6695YAUB+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6695YAUB+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 19 page extended temperature register (11h) (Table 3), which extends the temperature data to 10 bits + sign and the resolution to +0.125°C per LSB (Table 4). When a conversion is complete, the main register and the extended register are updated almost simultane- ously. Ensure that no conversions are completed between reading the main and extended registers so that when data that is read, 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: • Put the MAX6695/MAX6696 into standby mode by setting bit 6 of the configuration register to 1. Read the contents of the data registers. Return to run mode by setting bit 6 to zero. • Put the MAX6695/MAX6696 into standby mode by setting bit 6 of the configuration register to 1. Initiate a one-shot conversion using Send Byte command 0Fh. When this conversion is complete, read the contents of the temperature data registers. Diode Fault Alarm There is a continuity fault detector at DXP_ that detects an open circuit between DXP_ and DXN, or a DXP_ short to VCC, GND, or DXN. If an open or short circuit exists, the external temperature register (01h) is loaded with 1000 0000. Bit 2 (diode fault) of the status registers is correspondingly set to 1. The ALERT output asserts for open diode faults but not for shorted diode faults. Immediately after power-on reset (POR), the status reg- ister indicates that no fault is present until the end of the first conversion. After the conversion is complete, any diode fault is indicated in the appropriate status register. Reading the status register clears the diode fault bit in that register, and clears the ALERT output if set. If the diode fault is present after the next conver- sion, the status bit will again be set and the ALERT out- put will assert if the fault is an open diode fault. Alarm Threshold Registers Six registers, WLHO, WLLM, WRHA (1 and 2), and WRLN (1 and 2), store ALERT threshold values. WLHO and WLLM, are for internal ALERT high-temperature and low-temperature limits, respectively. Likewise, WRHA and WRLN are for external channel 1 and chan- nel 2 high-temperature and low-temperature limits, respectively (Table 5). If either measured temperature equals or exceeds the corresponding ALERT threshold value, the ALERT output is asserted. The POR state of both internal and external ALERT high-temperature limit registers is 0100 0110 or +70°C. Dual Remote/Local Temperature Sensors with SMBus Serial Interface 10 ______________________________________________________________________________________ TEMP ( °C) DIGITAL OUTPUT +130.00 0 111 1111 +127.00 0 111 1111 +126.00 0 111 1110 +25.25 0 001 1001 +0.50 0 000 0001 0 0 000 0000 -1 1 111 1111 -55 1 100 1001 Diode fault (short or open) 1 000 0000 Table 2. Data Format (Two’s Complement) FRACTIONAL TEMPERATURE ( °C) CONTENTS OF EXTENDED REGISTER 0 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 3. Extended Resolution Register Note: Extended resolution applies only for conversion rate control register values of 05h or less. TEMP ( °C) INTEGER TEMP FRACTIONAL TEMP +130.00 0 111 1111 000X XXXX +127.00 0 111 1111 000X XXXX +126.5 0 111 1110 100X XXXX +25.25 0 001 1001 010X XXXX +0.50 0 000 0000 100X XXXX 0 0 000 0000 000X XXXX -1 1 111 1111 000X XXXX -1.25 1111 1111 010X XXXX -55 1100 1001 000X XXXX Table 4. Data Format in Extended Mode |
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