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TMP400 Datasheet(PDF) 9 Page - Texas Instruments |
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TMP400 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 25 page  www.ti.com TEMPERATURE REGISTERS LIMIT REGISTERS STATUS REGISTER TMP400 SBOS404 – DECEMBER 2007 byte first) to pointer address 0Bh. The local temperature high limit is obtained by reading the high The TMP400 has four 8-bit registers that hold byte from pointer address 05h and the low byte from temperature measurement results. Both the local pointer address 16h. The power-on reset value of the channel and the remote channel have a high byte local temperature high limit is 7Fh/00h (+127 °C). register that contains the most significant bits (MSBs) of the temperature analog-to-digital converter (ADC) Similarly, the local temperature low limit is set by result, and a low byte register that contains the least writing the high byte to pointer address 0Ch and significant bits (LSBs) of the temperature ADC result. writing the low byte to pointer address 17h, or by The local channel high byte address is 00h; the local using a single two-byte write command to pointer channel low byte address is 15h. The remote channel address 0Ch. The local temperature low limit is read high byte is at address 01h; the remote channel low by reading the high byte from pointer address 06h byte address is 10h. These read-only registers are and the low byte from pointer address 17h, or by updated by the ADC each time a temperature using a two-byte read from pointer address 06h. The measurement is completed. power-on reset value of the local temperature low limit register is C9h/00h (–55 °C). The TMP400 contains circuitry to assure that a low byte register read command returns data from the The remote temperature high limit is set by writing the same ADC conversion as the immediately preceding high byte to pointer address 0Dh and writing the low high byte read command. This assurance remains byte to pointer address 13h, or by using a two-byte valid only until another register is read. For proper write command to pointer address 0Dh. The remote operation, the high byte of a temperature register temperature high limit is obtained by reading the high should be read first. The low byte register should be byte from pointer address 07h and the low byte from read in the next read command. The low byte register pointer address 13h, or by using a two-byte read may be left unread if the LSBs are not needed. command from pointer address 07h. The power-on Alternatively, the temperature registers may be read reset value of the Remote Temperature High Limit as a 16-bit register by using a single two-byte read Register is 7Fh/00h (+127 °C). command from address 00h for the local channel The remote temperature low limit is set by writing the result or from address 01h for the remote channel high byte to pointer address 0Eh and writing the low result. The high byte is output first, followed by the byte to pointer address 14h, or by using a two-byte low byte. Both bytes of this read operation are from write to pointer address 0Eh. The remote temperature the same ADC conversion. The power-on reset value low limit is read by reading the high byte from pointer of both temperature registers is 00h. address 08h and the low byte from pointer address 14h, or by using a two-byte read from pointer address 08h. The power-on reset value of the Remote Temperature Low Limit Register is C9h/00h (–55 °C). The TMP400 has eight registers for setting comparator limits for both the local and remote measurement channels. These registers have read and write capability. The High and Low Limit The TMP400 has a Status Register to report the state Registers for both channels span two registers, as do of the temperature comparators. Table 3 shows the the temperature registers. The local temperature high Status Register bits. The Status Register is read-only limit is set by writing the high byte to pointer address and is read by reading from pointer address 02h. 0Bh and writing the low byte to pointer address 16h, or by using a single two-byte write command (high Table 3. Status Register Format STATUS REGISTER (Read = 02h, Write = NA) BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT NAME BUSY LHIGH LLOW RHIGH RLOW OPEN — — POR VALUE 0(1) 0 0 0 0 0 0 0 (1) The BUSY bit will change to ‘1’ almost immediately (<< 100 µs) following power-up, as the TMP400 begins the first temperature conversion. It is high whenever the TMP400 converts a temperature reading. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TMP400 |
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