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AT30TS750SS8T Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT30TS750SS8T Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 50 page 5 Atmel AT30TS750 [DATASHEET] 8749C–DTS–6/12 2. Pin Descriptions and Pinouts Table 1. Pin Description Symbol Name and Function Asserted State Type SCL Serial Clock: This pin is used to provide a clock to the device and is used to control the flow of data to and from the device. Command and input data present on the SDA pin is always latched in on the rising edge of SCL, while output data on the SDA pin is always clocked out on the falling edge of SCL. The SCL pin must either be forced high when the serial bus is idle or pulled-high using an external pull-up resistor. — Input SDA Serial Data: The SDA pin is an open-drain bidirectional input/output pin used to serially transfer data to and from the device. The SDA pin must be pulled-high using an external pull-up resistor and may be wire-ANDed with any number of other open-drain or open-collector pins from other devices on the same bus. — Input/Output ALERT Alert: The ALERT pin is an open-drain output pin used to indicate when the temperature goes beyond the user-programmed temperature limits. The ALERT pin can be operated in one of two different modes (Interrupt or Comparator mode) as defined by the CMP/INT bit in the Configuration Register. The ALERT pin defaults to an active-low output upon device power-up or reset but can be reconfigured as an active-high output by setting the POL bit in the Configuration Register. This pin can be wire-ANDed together with ALERT pins from other devices on the same bus. When wire-ANDing pins together, the ALERT pin should be configured as an active-low output so that when a single ALERT pin on the common alert bus goes active, the entire common alert bus will go low and the host controller will be properly notified since other ALERT pins that may be in the inactive-high state will not mask the true alert signal. In an SMBus environment, the SMBus host can respond by sending an SMBus ARA (Alert Response Address) command to determine which device on the SMBus generated the alert signal. The ALERT pin must be pulled-high using an external pull-up resistor even when it is not used. Care must also be taken to prevent this pin from being shorted directly to ground without a resistor at any time whether during testing or normal operation. — Output A2-0 Address Inputs: The A2-0 pins are used to select the device address and correspond to the three least-significant bits (LSBs) of the I2C/SMBus 7-bit slave address. These pins can be directly connected in any combination to VCC or GND, and by utilizing the A2-0 pins, up to eight devices may be addressed on a single bus. The A2-0 pins are internally pulled to GND and may be left floating. However, it is highly recommended that the A2-0 pins always be directly connected to VCC or GND to ensure a known address state. — Input VCC Device Power Supply: The VCC pin is used to supply the source voltage to the device. Operations at invalid VCC voltages may produce spurious results and should not be attempted. — Power GND Ground: The ground reference for the power supply. GND should be connected to the system ground. — Power |
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