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TMP451-Q1 Datasheet(PDF) 17 Page - Texas Instruments |
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TMP451-Q1 Datasheet(HTML) 17 Page - Texas Instruments |
17 / 37 page ![]() Local and Remote Temperature Registers I/O Control Interface Pointer Register Configuration Register Status Register Local and Remote Temperature Limit Registers Conversion Rate Register Remote Temperature Offset Registers One-Shot Start Register Local and Remote THERM Limit Registers THERM Hysteresis Register N-factor Correction Register Consecutive ALERT Register Digital Filter Register Manufacturer ID Register SDA SCL 17 TMP451-Q1 www.ti.com SLOS877B – OCTOBER 2014 – REVISED JUNE 2019 Product Folder Links: TMP451-Q1 Submit Documentation Feedback Copyright © 2014–2019, Texas Instruments Incorporated 7.6.1 Register Information The TMP451-Q1 device contains multiple registers for holding configuration information, temperature measurement results, and status information. These registers are described in Figure 17 and Table 4. 7.6.1.1 Pointer Register Figure 17 shows the internal register structure of the TMP451-Q1 device. The 8-bit pointer register is used to address a given data register. The pointer register identifies which of the data registers should respond to a read or write command on the two-wire bus. This register is set with every write command. A write command must be issued to set the proper value in the pointer register before executing a read command. Table 4 describes the pointer register and the internal structure of the TMP451-Q1 registers. The power-on reset (POR) value of the pointer register is 00h (0000 0000b). Figure 17. Internal Register Structure 7.6.1.2 Temperature Registers The TMP451-Q1 device has multiple 8-bit registers that hold temperature measurement results. The eight most significant bits (MSBs) of the local temperature sensor result are stored in register 00h, while the four least significant bits (LSBs) are stored in register 15h (the four MSBs of register 15h). The eight MSBs of the remote temperature sensor result are stored in register 01h, and the four LSBs are stored in register 10h (the four MSBs of register 10h). The four LSBs of both the local sensor and the remote sensor indicate the temperature value after the decimal point (for example, if the temperature result is 10.0625 ˚C, the high byte is 0000 1010 and the low byte is 0001 0000). These registers are read-only and are updated by the ADC each time a temperature measurement is completed. When the full temperature value is needed, reading the MSB value first causes the LSB value to be locked (the ADC does not write to it) until it is read. The same thing happens upon reading the LSB value first (the MSB value is locked until it is read). This mechanism assures that both bytes of the read operation are from the same ADC conversion. This assurance remains valid only until another register is read. For proper operation, read the high byte of the temperature result first. Read the low byte register in the next read command; if the LSBs are not needed, the register may be left unread. The power-on reset value of all temperature registers is 00h. |
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