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TCN75-5.0MPA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TCN75-5.0MPA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 10 page 3 TCN75 PRELIMINARY INFORMATION 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR TCN75-04 6/16/97 SERIAL PORT TIMING (Cont.): 2.7V ≤ VDD ≤ 5.5V; – 55°C ≤ (TA = TJ ) ≤ 125°C, CL = 80pf, unless otherwise noted. Symbol Parameter Test Conditions Min Typ Max Unit tH(START) Start Condition Hold Time 1250 — — nsec tDSU Data in Setup Time to SCL High 100 — — nsec tDH Data in Hold Time after SCL Low 0 — — nsec tSU(STOP) Stop Condition Setup Time 1250 — — nsec tIDLE Bus Free Time Prior to New 1250 — — nsec Transition NOTES: 1. Output current should be minimized for best temperature accuracy. Power dissipation within the TCN75 will cause self-heating and temperature drift. At maximum rated output current and saturation voltage, 4mA and 0.8V, respectively, the error amounts to 0.352 °C for the PDIP, and 0.544 °C for the SOIC. 2. All part types of the TCN75 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1°C/V of VDD change. 3. Human body model, 100pF discharged through a 1.5k resistor, machine model, 200pF discharged directly into each pin. PIN DESCRIPTION Pin Number Symbol Description 1 SDA Bidirectional Serial Data. 2 SCL Serial Data Clock Input. 3 INT/CMPTR Interrupt or Comparator Output. 4 GND System Ground. 5A2 Address Select Pin (MSB). 6A1 Address Select Pin. 7A0 Address Select Pin (LSB). 8VDD Power Supply Input. DETAILED DESCRIPTION A typical TCN75 hardware connection is shown in Figure 1. Serial Data (SDA) Bidirectional. Serial data is transferred in both directions using this pin. Serial Clock (SCL) Input. Clocks data into and out of the TCN75. INT/CMPTR Open Collector, Programmable Polarity. In Comparator Mode, unconditionally driven active any time temperature exceeds the value programmed into the TSET register. INT/ CMPTR will become inactive when temperature subse- quently falls below the THYST setting. (See Register Set and Programmer's Model.) In Interrupt Mode, INT/CMPTR is also made active by TEMP exceeding TSET; it is uncondition- ally reset to its inactive state by reading any register via the 2-wire bus. If and when temperature falls below THYST, INT/ CMPTR is again driven active. Reading any register will clear the THYST interrupt. In Interrupt Mode, the INT/CMPTR output is unconditionally reset upon entering Shutdown Mode. If programmed as an active-low output, it can be wire-ORed with any number of other open collector devices. Most systems will require a pull-up resistor for this configu- ration. Note that current sourced from the pull-up resistor causes power dissipation and may cause internal heating of the TCN75. To avoid affecting the accuracy of ambient temperature readings, the pull-up resistor should be made as large as possible. INT/CMPTR's output polarity may be programmed by writing to the INT/CMPTR POLARITY bit in the CONFIG register. The default is active low. Address (A2, A1, A0) Inputs. Sets the three least significant bits of the TCN75 8-bit address. A match between the TCN75's address and the address specified in the serial bit stream must be made to initiate communication with the TCN75. Many protocol- compatible devices with other addresses may share the same 2-wire bus. Slave Address The four most significant bits of the Address Byte (A6, A5, A4, A3) are fixed to 1001[B]. The states of A2, A1 and |
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