tda9989et NXP Semiconductors, tda9989et Datasheet - Page 24

• Manufacturer Part Number: tda9989et
• Description: 150 Mhz Pixel Rate Hdmi 1.3a Transmitter With 3 ? 8-bit Video Inputs And Cec Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA9989_2
Product data sheet
7.10.1 Hot plug/unplug detect
7.10.2 Receiver sensitivity
7.10 Interrupt controller
Pin INT_HDMI is used to alert the micro controller that a critical event concerning the
HDMI or CEC has occurred. The software provided with the device read a status register
(I
before processing it. Some of theses interrupts are maskable. The interrupt types are
described in
Table 18.
The hot plug detect (HPD) pin is 5 V input tolerant. The HPD signal, when asserted, tells
the transmitter that the receiver is connected. When changing from LOW-to-HIGH, the
TDA9989 has to read the EDID of the receiver in order to select the video format that the
receiver can handle.
The TDA9989 has the capability to sense the receiver connectivity and working behavior.
This feature (RxSense) detects the presence of the 50
clock channel of the downstream side.
Interrupt domain
HPD
RxSense
Interrupt
EDID
CEC
Fig 15. Receiver sensitivity detection
2
C-bus) to determine which block between HDMI and CEC has caused the interruption
Interruptions
Table
18.
Interrupt name
hpd
rx_sense
sw_intsoftware
edid_block_rd
cec_int
Rev. 02 — 11 June 2009
Vinp_rxs
Vinn_rxs
HDMI cable
I_transmit
35 k
35 k
Definition
transition on HPD input
transition on RxSense
test purpose (output an
interrupt signal)
EDID block read finished maskable
CEC message received
HDMI 1.3a transmitter with CEC support
pole =
80 ns
RECEIVER
0.935 V 4 %
INTERNAL
BANDGAP
R pu
V
DD
pull-up resistor R
1.8 V
power_down
R pu
TDA9989
RXS_FIL
001aai452
V
CC
Maskable feature
maskable
maskable
maskable
not maskable
TDA9989
© NXP B.V. 2009. All rights reserved.
T
on the TMDS
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