2-WIRE SERIAL E2PROM WITH TEMPERATURE SENSOR S-34TS04L Rev.1.0_00_U Pin Functions1. VDD (Power supply) pin The VDD pin is used to apply positive supply voltage. Regarding the applied voltage value, refer to " Recommended Operation Conditions ". Set a bypass capacitor of about 0.1 μF between the VDD pin and the VSS pin for stabilization as close to IC as possible. 2. SA0, SA1 and SA2 (Select address input) pins In this IC, to set the slave address, connect each of the SA0 pin, SA1 pin and SA2 pin to the VSS pin or the VDD pin. Therefore the users can set 8 types of slave address by a combination of the SA0 pin, SA1 pin, SA2 pin. Comparing the slave address transmitted from the master device and one that you set, makes possible to select one slave address from other devices connected onto the bus. Each of the SA0 pin, SA1 pin and SA2 pin has a built-in pull-down resistor. In open, the pin is set to the same status as it connected to the VSS pin. The SA0 pin is used to detect the VHV voltage, when decoding an SWPn or CWP instruction. Refer to Table 11 for pin setting and device select code. 3. SDA (Serial data I/O) pin The SDA pin is used for the bi-directional transmission of serial data. This pin is a signal input pin, and an Nch open-drain output pin. In use, generally, connect the SDA line to any other device which has the open-drain or open-collector output with Wired-OR connection by pulling up to VDD by a resistor. 4. SCL (Serial clock input) pin The SCL pin is used for the serial clock input. Since the signals are processed at a rising or falling edge of the SCL clock, pay attention to the rising and falling time and comply with the specification. ___________ 5. EVENT (Temperature event output) pin ___________ The EVENT pin is an open-drain output that requires a pull-up resistor to VDD on the system motherboard or ___________ integrated into the master control er. EVENT pin has three operating modes, depending on the configuration register settings, and the output status is defined by the measured temperature and the temperature limit register setting. These modes are interrupt, comparator, or TCRIT only. Figure 4 shows an example of the measured temperature versus time, with the corresponding behavior of the ___________ EVENT pin in each of these three modes. 5. 1 Interrupt mode ___________ In interrupt mode, the EVENT pin will be asserted when the measured temperature crosses any temperature limit setting. Once the pin has been asserted, the pin will remain asserted until it is released by writing "1" to the CLEAR bit in the configuration register. After the pin is de-asserted, the pin will be re-asserted when the measured temperature crosses any temperature limit setting. 5. 2 Comparator mode ___________ In comparator mode, the EVENT pin will be asserted when the measured temperature is above the high limit or below "the low limit − hysteresis width". The pin will clear itself when the measured temperature is below "the high limit − hysteresis width" and above the low limit. 5. 3 TCRIT only mode ___________ In TCRIT only mode, the EVENT pin will only be asserted if the measured temperature exceeds the critical temperature. Once the pin has been asserted, it will remain asserted until the temperature drops below "the critical temperature − hysteresis width". 8
