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MAX7501MUA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX7501MUA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 13 page Register Descriptions The MAX7500/MAX7501/MAX7502 have an internal pn- junction-based temperature sensor whose analog out- put is converted to digital form using a 9-bit sigma-delta ADC. The measured temperature and tem- perature configurations are controlled by the tempera- ture, configuration, THYST, and TOS registers. See Table 2. Temperature Register Read the measured temperature through the tempera- ture register. The temperature data format is 9 bits, two’s complement, and the register is read out in 2 bytes: an upper byte and a lower byte. Bit D15 is the sign bit. When bit D15 is 1, the temperature reading is negative. When bit D15 is zero, the temperature read- ing is positive. Bits D14–D7 contain the temperature data, with the LSB representing 0.5 °C and the MSB representing 64 °C (see Table 3). The MSB is transmit- ted first. The last 7 bits of the lower byte, bits D6–D0, are don’t cares. When reading the temperature register, bits D6–D0 must be ignored. When the measured tem- perature is greater than +127.5 °C, the value stored in the temperature register is clipped to 7F8h. When the measured temperature is below -64 °C, the value in the temperature register is clipped to BF8h. During the time of reading the temperature register, any changes in temperature are ignored until the read is completed. The temperature register is updated upon completion of the next conversion. Table 3 lists the temperature register definition. Configuration Register The 8-bit configuration register sets the fault queue, OS polarity, shutdown control, and whether the OS output functions in comparator or interrupt mode. When writing to the configuration register, set bits D7, D6, and D5 to zero. See Table 5. Bits D4 and D3, the fault queue bits, determine the number of faults necessary to trigger an OS condition. See Table 6. The number of faults set in the queue must occur to trip the OS output. The fault queue pre- vents OS false tripping in noisy environments. Set bit D2, the OS polarity bit, to zero to force the OS output active low. Set bit D2 to 1 to set the OS output polarity to active high. OS is an open-drain output under all conditions and requires a pullup resistor to output a high voltage. See Figure 4. Set bit D1, the comparator/interrupt bit to zero to run the over-temperature shutdown block in comparator mode. In comparator mode, OS is asserted when the Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection 8 _______________________________________________________________________________________ REGISTER NAME ADDRESS (hex) POR STATE (hex) POR STATE (BINARY) POR STATE ( °C) READ/ WRITE Temperature 00 —— — Read only Configuration 01 00 0000 0000 — R/W THYST 02 4B0 0100 1011 0 75 R/W TOS 03 500 0101 0000 0 80 R/W Table 2. Register Functions UPPER BYTE LOWER BYTE D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Sign bit 1= Negative 0 = Positive MSB 64 °C 32 °C16°C8°C4°C2°C1°C LSB 0.5 °C xx xxx x x DIGITAL OUTPUT TEMPERATURE ( °C) BINARY hex +125 0111 1101 0xxx xxxx 7D0x +25 0001 1001 0xxx xxxx 190x +0.5 0000 0000 1xxx xxxx 008x 0 0000 0000 0xxx xxxx 000x -0.5 1111 1111 1xxx xxxx FF8x -25 1110 0110 0xxx xxxx E70x -55 1100 1000 0xxx xxxx C90x Table 3. Temperature Register Definition Table 4. Temperature Data Output X = Don’t care. |
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