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TMP422AIDCNR Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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TMP422AIDCNR Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 26 page www.ti.com TEMPERATURE REGISTERS STATUS REGISTER CONFIGURATION REGISTER 1 TMP421 TMP422 SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007 The TMP421/22 have four 8-bit registers that hold The Status Register reports the state of the temperature measurement results. Both the local temperature ADCs. Table 4 shows the Status channel and the remote channel have a high byte Register bits. The Status Register is read-only, and is register that contains the most significant bits (MSBs) read accessing pointer address 08h. of the temperature analog-to-digital converter (ADC) The BUSY bit = '1' if the ADC is making a conversion; result and a low byte register that contains the least it is set to '0' if the ADC is not converting. significant bits (LSBs) of the temperature ADC result. The local channel high byte address is 00h; the local channel low byte address is 10h. The remote channel high byte is at address 01h; the remote channel low Configuration Register 1 (pointer address 09h) sets byte address is 11h. For the TMP422, the second the temperature range and controls shutdown mode. remote channel high byte address is 02h; the second The Configuration Register is set by writing to pointer remote channel low byte is 12h. These registers are address 09h and read by reading from pointer read-only and are updated by the ADC each time a address 09h. temperature measurement is completed. The shutdown (SD) bit (bit 6) enables or disables the The TMP421/22 contain circuitry to assure that a low temperature measurement circuitry. If SD = '0', the byte register read command returns data from the TMP421/22 converts continuously at the rate set in same ADC conversion as the immediately preceding the conversion rate register. When SD is set to '1', high byte read command. This assurance remains the TMP421/22 stops converting when the current valid only until another register is read. For proper conversion sequence is complete and enters a operation, the high byte of a temperature register shutdown mode. When SD is set to '0' again, the should be read first. The low byte register should be TMP421/22 resumes continuous conversions. When read in the next read command. The low byte register SD = '1', a single conversion can be started by writing may be left unread if the LSBs are not needed. to the One-Shot Register. Alternatively, the temperature registers may be read The temperature range is set by configuring bit 2 of as a 16-bit register by using a single two-byte read the Configuration Register. Setting this bit low command from address 00h for the local channel configures the TMP421/22 for the standard result, or from address 01h for the remote channel measurement range (–55 °C to +127°C); temperature result (02h for the second remote channel result). conversions will be stored in the standard binary The high byte is output first, followed by the low byte. format. Setting bit 2 high configures the TMP421/22 Both bytes of this read operation are from the same for the extended measurement range (–55 °C to ADC conversion. The power-on reset value of all +150 °C); temperature conversions will be stored in temperature registers is 00h. the extended binary format (see Table 1). Table 4. Status Register Format STATUS REGISTER (Read = 08h, Write = NA) BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT NAME BUSY 0 0 0 0 0 0 0 POR VALUE 0(1) 0 0 0 0 0 0 0 (1) FOR TMP421: The BUSY changes to '1' almost immediately (< 100 μs) following power-up, as the TMP421 begins the first temperature conversion. It is high whenever the TMP421 converts a temperature reading. FOR TMP422: The BUSY bit changes to '1' approximately 1ms following power-up. It is high whenever the TMP422 converts a temperature reading. 10 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TMP421 TMP422 |
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