TDA9989ET/C1,551 NXP Semiconductors, TDA9989ET/C1,551 Datasheet - Page 26

• Manufacturer Part Number: TDA9989ET/C1,551
• Description: IC HDMI TX 1.3A 150MHZ 64-TFBGA
• Manufacturer: NXP Semiconductors
• Type: Transmitterr

Specifications of TDA9989ET/C1,551

• Applications: Cameras, Cell Phones, Media Players
• Mounting Type: Surface Mount
• Package / Case: 64-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935288146551

NXP Semiconductors
TDA9989_2
Product data sheet
7.11.2 Clock
CEC clock must be running in Sleep mode (with CEC) to wake up the TDA9989 using
CEC specific message as described in “HDMI 1.3a specification” .
CEC module can be clocked using:
CEC operates normally (i.e. matches the timing requested CEC specification) if and only if
its clock frequency is 12 MHz.
So, for clock frequency higher than 12 MHz a calibration is needed. A calibration module
located between the clock source and the CEC module is used to divide the incoming
clock to cope the right frequency range see
Calibration procedure is completely handled by the software delivered together with the
device, it has the following steps:
CEC clock calibration must be performed at each power-up and each time the TDA9989
moves from Standby or Sleep (without CEC) state to normal operating mode.
Fig 16. Modules involved in CEC clock calibration process
•
•
•
•
•
External clocks:
– 12 MHz crystal.
– 12 MHz to 50 MHz clock available on PCB
Internal clock:
– FRO (Free Running Oscillator). FRO frequency varies per device basic
Host processor set the TDA9989 in calibration mode
Host processor generates a negative pulse of 10 ms
Host processor deselects the calibration mode when it is completed, the chip is ready
to operate.
(1) Crystal or other system clock source
(temperature, process, voltage) and is ranges from 12.64 MHz to 12.9 MHz.
OSC_IN
OSC_OUT
(1)
Rev. 02 — 11 June 2009
FRO
CEC clock calibration module
I
2
C
HOST PROCESSOR
INT_HDMI
DIVIDER
Figure
HDMI 1.3a transmitter with CEC support
TDA9989
I
2
16.
C
I
2
C
1 % on INT_HDMI pin
CEC CLK
12 MHz
TDA9989
MODULE
© NXP B.V. 2009. All rights reserved.
CEC
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