KIT34844AEPEVBE Freescale Semiconductor, KIT34844AEPEVBE Datasheet - Page 49

• Manufacturer Part Number: KIT34844AEPEVBE
• Description: LED Lighting Development Kits IC, 10 CHANNEL LED BACKLIGHT
• Manufacturer: Freescale Semiconductor

Specifications of KIT34844AEPEVBE

• Supply Voltage: 12 V
• Supply Current: 2 uA
• For Use With/related Products: 34844A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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