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ADM1025ARQZ-REEL データシート(PDF) 11 Page - ON Semiconductor |
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ADM1025ARQZ-REEL データシート(HTML) 11 Page - ON Semiconductor |
11 / 21 page Preliminary Technical Data ADM1025/ADM1025A Rev. P5 | Page 11 of 21| www.onsemi.com Figure 12. Writing to the Address Pointer Register Only Figure 13. Reading Data from a Previously Selected Register When reading data from a register there are two possibilities: 1. If the ADM1025/ADM1025A’s Address Pointer Register value is unknown or not the desired value, it is first necessary to set it to the correct value before data can be read from the desired data register. This is done by performing a write to the ADM1025/ADM1025A as before, but only the data byte containing the register address is sent, since data should not be written to the register. This is shown in Figure 12. A read operation is then performed consisting of the serial bus address, R/W bit set to 1, followed by the data byte read from the data register. This is shown in Figure 13. 2. If the Address Pointer Register is known to be already at the desired address, data can be read from the corresponding data register without first writing to the Address Pointer Register, so Figure 12 can be omitted. NOTES 1. Although it is possible to read a data byte from a data register without first writing to the Address Pointer Register, if the Address Pointer Register is already at the correct value, it is not possible to write data to a register without writing to the Address Pointer Register because the first data byte of a write is always written to the Address Pointer Register. 2. In Figure 11 to Figure 13, the serial bus address is shown as the default value 01011(A1)(A0), where A1 and A0 are set by the three-state ADD pin. 3. In addition to supporting the Send Byte and Receive Byte protocols, the ADM1025/ADM1025A also supports the Read Byte protocol (see System Management Bus specifications Rev. 1.1 for more information). 4. If Reset or interrupt functionality is required, the address pin cannot be strapped to GND, since this would keep the ADD/RST/INT/NTO pin permanently low. MEASUREMENT INPUTS The ADM1025/ADM1025A has six external measurement inputs, five for voltage and one (two pins) for temperature. Internal measurements are also carried out on VCC and the on- chip temperature sensor. A/D CONVERTER These inputs are multiplexed into the on-chip, successive- approximation, analog-to-digital converter. This has a resolution of eight bits. The basic input range is 0 V to 2.5 V, but the inputs have built-in attenuators to allow measurement of 2.5 V, 3.3 V, 5 V, 12 V, and the processor core voltage VCCP without any external components. To allow for the tolerance of these supply voltages, the A/D converter produces an output of ¾ full scale (decimal 192) for the nominal input voltage and so has adequate headroom to cope with overvoltages. Table 5 shows the input ranges of the analog inputs and output codes of the A/D converter. When the ADC is running, it samples and converts an input every 11.6 ms, except for the external temperature (D+ and D−) input. This has special input signal conditioning and is averaged over 16 conversions to reduce noise; a measurement on this input takes nominally 34.8 ms. |
同様の部品番号 - ADM1025ARQZ-REEL |
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同様の説明 - ADM1025ARQZ-REEL |
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