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TCN75-3.3MUA Datasheet(PDF) 5 Page - TelCom Semiconductor, Inc |
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TCN75-3.3MUA Datasheet(HTML) 5 Page - TelCom Semiconductor, Inc |
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5 / 10 page  5 TCN75 PRELIMINARY INFORMATION 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR TCN75-04 6/16/97 Address Byte Immediately following the Start Condition, the host must next transmit the address byte to the TCN75. The four most significant bits of the Address Byte (A6, A5, A4, A3) are fixed to 1001(B). The states of A2, A1 and A0 in the serial bit stream must match the states of the A2, A1 and A0 address inputs for the TCN75 to respond with an Acknowledge (indicating the TCN75 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write Bit. This bit is a 1 for a read operation or 0 for a write operation. Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TCN75. The host releases SDA after transmitting eight bits then generates a ninth clock cycle to allow the TCN75 to pull the SDA line LOW to acknowledge that it successfully received the previous eight bits of data or address. Data Byte After a successful ACK of the address byte, the host must next transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the TCN75. Stop Condition (STOP) Communications must be terminated by a stop condi- tion (a LOW to HIGH transition of SDA while SCL is HIGH). The Stop Condition must be communicated by the transmit- ter to the TCN75. Power Supply To minimize temperature measurement error, the TCN75VO_-3 is factory calibrated at a supply voltage of 3.3V ±5V and the TCN75CO_-5 is factory calibrated at a supply voltage of 5V ±5%. Either device is fully operational A0 A1 A2 SDA SCL +VDD (3V to 5.5V) Address (Set as Desired) I2C Interface CBypass TO PROCESSOR 0.1 µF Recommended Unless Device is Mounted Close to CPU INT/CMPTR 7 6 5 1 2 3 8 4 TCN75 Figure 1. Typical Application over the power supply voltage range of 2.7V to 5.5V, but with a lower measurement accuracy. Figure 2 shows the worst case temperature measurement error for the TCN75CO_-3 operated at a power supply voltage of 5V ± 10%. Figure 3 shows the worst case temperature measure- ment error for the TCN75CO_-3 operated at a power supply voltage of 3.3V ±10%. Figure 2. TCN75CO_-3 Measurement Error at VDD = 5V ± 10% Figure 3. TCN75CO_-5 Measurement Error at VDD = 3.3V ± 10% ±5 ±4 ±3 ±2 ±1 TCN75 Case Temeprature ( °C) 20 35 50 65 80 125 95 110 ±5 ±4 ±3 ±2 ±1 TCN75 Case Temeprature ( °C) 20 35 50 65 80 125 95 110 |
Similar Part No. - TCN75-3.3MUA |
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Similar Description - TCN75-3.3MUA |
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