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ADM1023 Datenblatt(PDF) 11 Page - ON Semiconductor |
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ADM1023 Datenblatt(HTML) 11 Page - ON Semiconductor |
11 / 16 page ADM1023 http://onsemi.com 11 Table 9. STATUS REGISTER BIT ASSIGNMENTS Bit Name Function 7 BUSY At 1 when ADC converting 6 LHIGH* At 1 when local high temp limit tripped 5 LLOW* At 1 when local low temp limit tripped 4 RHIGH* At 1 when remote high temp limit tripped 3 RLOW* At 1 when remote low temp limit tripped 2 OPEN* At 1 when remote sensor open-circuit 1 to 0 Reserved *These flags stay high until the status register is read or they are reset by POR. Configuration Register Two bits of the configuration register are used. If Bit 6 is 0, which is the power-on default, the device is in operating mode with the ADC converting (see Table 10). If Bit 6 is set to 1, the device is in standby mode and the ADC does not convert. Standby mode can also be selected by taking the STBY pin low. In standby mode, the values of remote and local temperature remain at the value they were before the part was placed in standby mode. Bit 7 of the configuration register is used to mask the ALERT output. If Bit 7 is 0, which is the power-on default, the ALERT output is enabled. If Bit 7 is set to 1, the ALERT output is disabled. Table 10. CONFIGURATION REGISTER BIT ASSIGNMENTS Bit Name Function Power-on Default 7 MASK1 0 = ALERT Enabled 1 = ALERT Masked 0 6 RUN/STOP 0 = Run 1 = Standby 0 5 to 0 Reserved 0 Conversion Rate Register The lowest three bits of this register are used to program the conversion rate by dividing the ADC clock by 1, 2, 4, 8, 16, 32, 64, or 128, to give conversion times from 125 ms (Code 0x07) to 16 seconds (Code 0x00). This register can be written to and read back over the SMBus. The higher five bits of this register are unused and must be set to 0. Use of slower conversion times greatly reduces the device’s power consumption, as shown in Table 11. Table 11. CONVERSION RATE REGISTER CODE Data Conversion/Sec Average Supply Current mA Typ at VCC = 3.3 V 0x00 0.0625 150 0x01 0.125 150 0x02 0.25 150 0x03 0.5 150 0x04 1 150 0x05 2 150 0x06 4 160 0x07 8 180 0x08 to 0xFF Reserved Limit Registers The ADM1023 has six limit registers to store local and remote, high and low temperature limits. These registers can be written to and read back over the SMBus. The high limit registers perform a > comparison, while the low limit registers perform a < comparison. For example, if the high limit register is programmed as a limit of 80C, measuring 81C results in an alarm condition. Even though the temperature range is 0 to 127C, it is possible to program the limit register with negative values. This is for backward-compatibility with the ADM1021. One−Shot Register The one-shot register is used to initiate a single conversion and comparison cycle when the ADM1023 is in standby mode, after which the device returns to standby. This is not a data register as such, and it is the write operation that causes the one-shot conversion. The data written to this address is irrelevant and is not stored. Serial Bus Interface Control of the ADM1023 is carried out via the serial bus. The ADM1023 is connected to this bus as a slave device, under the control of a master device. Note that the SMBus SDA and SCLK pins are three-stated when the ADM1023 is powered down, and they do not pull down the SMBus. Address Pins In general, every SMBus device has a 7-bit device address (except for some devices that have extended, 10-bit addresses). When the master device sends a device address over the bus, the slave device with that address responds. The ADM1023 has two address pins, ADD0 and ADD1, to allow selection of the device address, so that several ADM1023s can be used on the same bus and to avoid conflict with other devices. Although only two address pins are provided, these pins are three-state and can be grounded, left unconnected, or tied to VDD, so that a total of nine different addresses are possible, as shown in Table 12. Note that the state of the address pins is sampled only at powerup, so changing them after powerup has no effect. |
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