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DS1683

Total-Elapsed-Time and Event Recorder with Alarm

of this phenomenon by repeatedly addressing the

DS1683, which allows communication to continue

as soon as the DS1683 is ready. The alternative to

acknowledge polling is to wait for a maximum period

of tW to elapse before attempting to access the device.

EEPROM Write Cycles: The DS1683’s EEPROM

write cycles are specified in the Nonvolatile Memory

Characteristics table. The specification shown is at

the worst-case temperature (hot). It can handle many

additional writes at room temperature.

Reading a Single Byte from a Slave: Unlike the write

operation that uses the specified memory address

byte to define where the data is to be written, the read

operation occurs at the present value of the memory

address counter. To read a single byte from the slave,

the master generates a START condition, writes the

slave address byte with R/W = 1, reads the data byte

with a NACK to indicate the end of the transfer, and

generates a STOP condition. However, since requiring

the master to keep track of the memory address coun-

ter is impractical, the following method should be used

to perform reads from a specified memory location.

Manipulating the Address Counter for Reads: A

dummy write cycle can be used to force the address

counter (or pointer) to a particular value. To do this, the

master generates a START condition, writes the slave

address byte (R/W = 0), writes the memory address

where it desires to read, generates a repeated START

condition, writes the slave address byte (R/W = 1),

reads data with ACK or NACK as applicable, and

generates a STOP condition. Recall that the master

must NACK the last byte to inform the slave that no

additional bytes will be read. See Figure 9 for I2C com-

munication examples.

Reading Multiple Bytes from a Slave: The read

operation can be used to read multiple bytes with a

single transfer. When reading bytes from the slave,

the master simply ACKs the data byte if it desires to

read another byte before terminating the transaction.

After the master reads the last byte it must NACK to

indicate the end of the transfer and generates a STOP

condition.

Applications Information

Power-Supply Decoupling

To achieve best results, it is recommended that the power

supply is decoupled with a 0.01FF or a 0.1FF capacitor.

Use high-quality, ceramic, surface-mount capacitors,

and mount the capacitors as close as possible to the VCC

and GND pins to minimize lead inductance.

SDA and SCL Pullup Resistors

SDA is an open-collector output on the DS1683 that

requires a pullup resistor to realize high-logic levels. An

I2C master using either an open-collector output with

a pullup resistor or a push-pull output driver can be

used for SCL. Pullup resistor values should be chosen

to ensure that the rise and fall times listed in the I2C AC

Electrical Characteristics are within specification.

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