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TMP411-Q1 Datasheet(PDF) 14 Page - Texas Instruments |
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TMP411-Q1 Datasheet(HTML) 14 Page - Texas Instruments |
14 / 40 page ![]() TMP411-Q1 SBOS527F – DECEMBER 2010 – REVISED NOVEMBER 2013 www.ti.com TEMPERATURE REGISTERS Similarly, the local-temperature low limit is set by writing the high byte to pointer address 0Ch and The TMP411-Q1 has four 8-bit registers that hold writing the low byte to pointer address 17h, or by temperature measurement results. Both the local using a single two-byte write command to pointer channel and the remote channel have a high-byte address 0Ch. The local-temperature low limit is read register that contains the most-significant bits (MSBs) by reading the high byte from pointer address 06h of the temperature analog-to-digital converter (ADC) and the low byte from pointer address 17h, or by result and a low-byte register that contains the least- using a two-byte read from pointer address 06h. The significant bits (LSBs) of the temperature ADC result. power-on-reset value of the local-temperature low- The local-channel high-byte address is 00h; the local- limit register is 00h/00h (0°C in standard temperature channel low-byte address is 15h. The remote-channel mode; –64°C in extended mode). high byte is at address 01h; the remote-channel low- byte address is 10h. These registers are read-only The remote-temperature high limit is set by writing and are updated by the ADC each time a temperature the high byte to pointer address 0Dh and writing the measurement is completed. low byte to pointer address 13h, or by using a two- byte write command to pointer address 0Dh. The The TMP411-Q1 contains circuitry to assure that a remote-temperature high limit is obtained by reading low-byte register-read command returns data from the high byte from pointer address 07h and the low the same ADC conversion as the immediately byte from pointer address 13h, or by using a two-byte preceding high-byte read command. This assurance read command from pointer address 07h. The power- remains valid only until another register is read. For on-reset value of the Remote Temperature High Limit proper operation, the high byte of a temperature Register is 55h/6Eh/00h (85°C in standard register should be read first. The low-byte register temperature mode for TMP411A-Q1 to TMP411C-Q1; should be read in the next read command. The low 110°C in standard temperature mode for TMP411D- byte register may be left unread if the LSBs are not Q1; 21°C in extended temperature mode). needed. Alternatively, the temperature registers may be read as a 16-bit register by using a single two-byte The remote-temperature low limit is set by writing the read command from address 00h for the local- high byte to pointer address 0Eh and writing the low channel result or from address 01h for the remote- byte to pointer address 14h, or by using a two-byte channel result. The high byte is output first, followed write to pointer address 0Eh. The remote-temperature by the low byte. Both bytes of this read operation are low limit is read by reading the high byte from pointer from the same ADC conversion. The power-on-reset address 08h and the low byte from pointer address value of both temperature registers is 00h. 14h, or by using a two-byte read from pointer address 08h. The power-on-reset value of the Remote LIMIT REGISTERS Temperature Low Limit Register is 00h/00h (0°C in standard temperature mode; –64°C in extended The TMP411-Q1 has 11 registers for setting mode). comparator limits for both the local and remote measurement channels. These registers have read The TMP411-Q1 also has THERM limit registers for and write capability. The High and Low Limit both the local and the remote channels. These Registers for both channels span two registers, as do registers are eight bits and allow for THERM limits set the temperature registers. The local-temperature high to 1°C resolution. The local-channel THERM limit is limit is set by writing the high byte to pointer address set by writing to pointer address 20h. The remote- 0Bh and writing the low byte to pointer address 16h, channel THERM limit is set by writing to pointer or by using a single two-byte write command (high address 19h. The local channel THERM limit is byte first) to pointer address 0Bh. The local- obtained by reading from pointer address 20h; the temperature high limit is obtained by reading the high remote channel THERM limit is read by reading from byte from pointer address 05h and the low byte from pointer address 19h. The power-on-reset value of the pointer address 16h or by using a two-byte read THERM limit registers is 55h/6Eh/00h (85°C in command from pointer address 05h. The power-on- standard temperature mode for TMP411A-Q1 to reset value of the local temperature high limit is TMP411C-Q1; 110°C in standard temperature mode 55h/6Eh/00h (85°C in standard temperature mode for for TMP411D-Q1; 21°C in extended temperature TMP411A-Q1 to TMP411C-Q1; 110°C in standard mode). The THERM limit comparators also have temperature mode for TMP411D-Q1, 21°C in hysteresis. The hysteresis of both comparators is set extended temperature range). by writing to pointer address 21h. The hysteresis value is obtained by reading from pointer address 21h. The value in the Hysteresis Register is an unsigned number (always positive). The power-on- reset value of this register is 0Ah (10°C). 14 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: TMP411-Q1 |
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