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TMP411 Datasheet(PDF) 15 Page - Burr-Brown (TI) |
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TMP411 Datasheet(HTML) 15 Page - Burr-Brown (TI) |
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15 / 28 page  TMP411 SBOS383A − FEBRUARY 2007 www.ti.com 15 THERM HYSTERESIS REGISTER The THERM Hysteresis Register stores the hysteresis value used for the THERM pin alarm function. This register must be programmed with a value that is less than the Local Temperature High Limit Register value, Remote Temperature High Limit Register value, Local THERM Limit Register value, or Remote THERM Limit Register value; otherwise, the respective temperature comparator will not trip on the measured temperature falling edges. Allowable hysteresis values are shown in Table 10. The default hysteresis value is 10 °C, whether the device is operating in the standard or extended mode setting. Table 10. Allowable THERM Hysteresis Values THERM HYSTERESIS VALUE TEMPERATURE ( °C) TH[11:4] (STANDARD BINARY) (HEX) 0 0000 0000 00 1 0000 0001 01 5 0000 0101 05 10 0000 1010 0A 25 0001 1001 19 50 0011 0010 32 75 0100 1011 4B 100 0110 0100 64 125 0111 1101 7D 127 0111 1111 7F 150 1001 0110 96 175 1010 1111 AF 200 1100 1000 C8 225 1110 0001 E1 255 1111 1111 FF BUS OVERVIEW The TMP411 is SMBus interface-compatible. In SMBus protocol, the device that initiates the transfer is called a master, and the devices controlled by the master are slaves. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. To address a specific device, a START condition is initiated. START is indicated by pulling the data line (SDA) from a high to low logic level while SCL is high. All slaves on the bus shift in the slave address byte, with the last bit indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed responds to the master by generating an Acknowledge and pulling SDA low. Data transfer is then initiated and sent over eight clock pulses followed by an Acknowledge bit. During data transfer SDA must remain stable while SCL is high, because any change in SDA while SCL is high is interpreted as a control signal. Once all data has been transferred, the master generates a STOP condition. STOP is indicated by pulling SDA from low to high, while SCL is high. SERIAL INTERFACE The TMP411 operates only as a slave device on either the Two-Wire bus or the SMBus. Connections to either bus are made via the open-drain I/O lines, SDA and SCL. The SDA and SCL pins feature integrated spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise. The TMP411 supports the transmission protocol for fast (1kHz to 400kHz) and high-speed (1kHz to 3.4MHz) modes. All data bytes are transmitted MSB first. SERIAL BUS ADDRESS To communicate with the TMP411, the master must first address slave devices via a slave address byte. The slave address byte consists of seven address bits, and a direction bit indicating the intent of executing a read or write operation. The address of the TMP411 is 4Ch (1001100b). READ/WRITE OPERATIONS Accessing a particular register on the TMP411 is accomplished by writing the appropriate value to the Pointer Register. The value for the Pointer Register is the first byte transferred after the slave address byte with the R/W bit low. Every write operation to the TMP411 requires a value for the Pointer Register (see Figure 14). Table 11. THERM Hysteresis Register Format THERM HYSTERESIS REGISTER (Read = 21h, Write = 21h, POR = 0Ah) BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT NAME TH11 TH10 TH9 TH8 TH7 TH6 TH5 TH4 POR VALUE 0 0 0 0 1 0 1 0 |
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