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ADM1023ARQZ-REEL データシート(PDF) 9 Page - ON Semiconductor |
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ADM1023ARQZ-REEL データシート(HTML) 9 Page - ON Semiconductor |
9 / 16 page ADM1023 http://onsemi.com 9 Temperature Data Format One LSB of the ADC corresponds to 0.125C, so the ADM1023 can measure from 0C to 127.875C. The temperature data format and extended temperature resolution are shown in Table 5 and Table 6. Table 5. TEMPERATURE DATA FORMAT (LOCAL AND REMOTE TEMPERATURE HIGH BYTE) Temperature (5C) (Note 1) Digital Output 0 0 000 0000 1 0 000 0001 10 0 000 1010 25 0 001 1001 50 0 011 0010 75 0 100 1011 100 0 110 0100 125 0 111 1101 127 0 111 1111 1. The ADM1023 differs from the ADM1021 in that the temperature resolution of the remote channel is improved from 1C to 0.125C, but it cannot measure temperatures below 0C. If negative temperature measurement is required, the ADM1021 should be used. The results of the local and remote temperature measurements are stored in the local and remote temperature value registers and are compared with limits programmed into the local and remote high and low limit registers. Table 6. EXTENDED TEMPERATURE RESOLUTION (REMOTE TEMPERATURE LOW BYTE) Extended Resolution (5C) Temperature Low Bits 0.000 0000 0000 0.125 0010 0000 0.250 0100 0000 0.375 0110 0000 0.500 1000 0000 0.625 1010 0000 0.750 1100 0000 0.875 1110 0000 Register Functions The ADM1023 contains registers that are used to store the results of remote and local temperature measurements and high and low temperature limits, and to configure and control the device. A description of these registers follows, and further details are given in Table 7 to Table 11. Most of the registers for the ADM1023 are dual-port and have different addresses for read and write operations. Attempting to write to a read address or to read from a write address produces an invalid result. Register addresses above 0x14 are reserved for future use or factory test purposes and should not be written to. Address Pointer Register The address pointer register does not have, nor does it require, an address, because it is the register to which the first data byte of every write operation is automatically written. This data byte is an address pointer that sets up one of the other registers for the second byte of the write operation or for a subsequent read operation. Value Registers The ADM1023 has three registers to store the results of local and remote temperature measurements. These registers are written to by the ADC and can only be read over the SMBus. The Offset Register Two offset registers are provided at Address 0x11 and Address 0x12. These are provided so that the user may remove errors from the measured values of remote temperature. These errors may be introduced by clock noise and PCB track resistance. See Table 8 for an example of offset values. The offset value is stored as an 11-bit, twos complement value in Register 0x11 (high byte) and Register 0x12 (low byte, left justified). The value of the offset is negative if the MSB of Register 0x11 is 1, and it is positive if the MSB of Register 0x11 is 0. This value is added to the remote temperature. These registers default to 0 at powerup and have no effect if nothing is written to them. The offset register can accept values from −128.875C to +127.875C. The ADM1023 detects overflow so the remote temperature value register does not wrap around +127C or −128C. |
同様の部品番号 - ADM1023ARQZ-REEL |
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同様の説明 - ADM1023ARQZ-REEL |
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