AT30TSE754A_14 Datasheet, PDF (6/57 Pages) ATMEL Corporation – Digital Temperature Sensor with Nonvolatile Registers

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
A_2-0
Address Inputs: The A_2-0 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 V_CC or GND, and by utilizing the
A_2-0 pins, up to eight devices may be addressed on a single bus.
—
The A_2-0 pins are internally pulled to GND and may be left floating; however, it is highly
recommended that the A_2-0 pins always be directly connected to V_CC or GND to ensure
a known address state.
Input
V_CC
Device Power Supply: The V_CC pin is used to supply the source voltage to the device.
Operations at invalid V_CC 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
6
AT30TSE752A/754A/758A [DATASHEET]
Atmel-8854G-DTS-AT30TSE752A-754A-758A-Datasheet_102014