pnx1700 NXP Semiconductors, pnx1700 Datasheet - Page 290

• Manufacturer Part Number: pnx1700
• Description: Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
Figure 8:
Figure 9:
Figure 10: Sub-Carrier Multiplexing for TX
EN_IR_CARRIER,CARRIER_DIV
Ir TX Sub-carrier
Frequency
Ir TX Frequency
Ir TX signal
(no sub-carrier)
Ir TX signal
(with sub-carrier)
Example of Ir TX Signals with and without Sub-Carrier
IrDA Control TX with Sub-Carrier Enabled
DUTY_CYCLE
3.1 Duty-cycle programming
FREQ_DIV
required TX frequency and have the option to multiplex a sub-carrier frequency onto
the TX frequency if required.
requirements.
In the RC-MM IR protocol the duty-cycle of the sub-carriers must be between 25-
50%. To accommodate this protocol and others it is possible to program the duty-
cycle to be either 33%, 50%, or 66%.
IrDA Control
signal
Sub-carrier
Generation
Rev. 1 — 17 March 2006
Pattern
Generator
10 sub-carriers
6.67 s
Figure 8 Figure 9
sub-carrier
Chapter 8: General Purpose Input Output Pins
Data
and
Figure 10
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
EN_IR_CARRIER
PNX17xx Series
1
0
illustrate the signal
IROUT
8-19