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MC34844A
FUNCTIONAL DEVICE OPERATION
I2C BUS SPECIFICATION
charge of controlling LED dimming and enabling the device
every time the PWM is active. For this configuration the EN
pin should be LOW.
I2C BUS SPECIFICATION
The 34844A is a unidirectional device that can only be written by an external control unit. Since the device is a 7 bit address
device (1110110), the control unit needs to follow a specific data transfer format which is shown in Table 26 .
Figure 26. A Complete Data Transfer
For a complete data transfer, please use this format in the
following order:
1. START condition
2. 34844A device address and Write instruction (R/W = 0)
3. First data pack, it corresponds to the 34844A register
that needs to be written. (refer to Table 13 )
4. Second data pack, it corresponds to the value that
should be written to that register. (refer to Table 13 )
5. STOP condition
I 2 C variables description:
? START: this condition occurs when SDA changes from
HIGH to LOW while SCK is HIGH.
? ACKNOWLEDGE: The acknowledge clock pulse is
generated by the Master (Control Unit).
? The transmitter releases the SDA line (HIGH) during the
acknowledge clock pulse.The receiver (34844A) must pull
down the SDA line during this acknowledge pulse to
indicate that the data was correctly written.
? Bits in the first byte: The first seven bits of the first bite
make up the slave address. The eighth bit is the LSB (least
significant bit), which determines the direction of the
message (Write = 0)
For the 34844A device, when an address is sent, each of
the devices in a system compares the first seven bits after
the START condition with its address. If they match, the
device considers itself addressed by the control unit as a
slave-receiver.
? STOP: this condition occurs when SDA changes from
LOW to HIGH while SCK is HIGH
For more information about “I 2 C BUS SPECIFICATION”
please refer to the following link:
http://www.nxp.com/acrobat_download/literature/
9398/39340011.pdf
34844A
Analog Integrated Circuit Device Data
Freescale Semiconductor
49
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