PNX1501E NXP Semiconductors, PNX1501E Datasheet - Page 280

• Manufacturer Part Number: PNX1501E
• Description: Digital Signal Processors & Controllers (DSP, DSC) MEDIA PROCESSOR PNX15XX/266MHZ
• Manufacturer: NXP Semiconductors

Specifications of PNX1501E

• Product: DSPs
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-795
• Minimum Operating Temperature: 0 C
• Lead Free Status / Rohs Status: Details
• Other names: PNX1501E,557

Philips Semiconductors
Volume 1 of 1
12NC 9397 750 14321
Product data sheet
Figure 11: Examples of Duty Cycles for Ir TX Signals
IROUT
Actual Sub-carrier Freq.
Programmed Freq.
3.2 Spike Filtering
In the 33% and 66% duty-cycle cases FREQ_DIV must be programmed such that the
resulting frequency is 3 times the actual sub-carrier frequency, i.e the minimum pulse
width (high or low) is programmed. Similarly, in the 50% duty-cycle case FREQ_DIV
must be programmed such that the resulting frequency is 2 times the actual sub-
carrier frequency.
33%
When signal sampling at a programmed frequency a filtering feature is available in
the GPIO module which filters out spikes which may occur on a Ir RX signal. This
feature is enabled by programming the EN_IR_FILTER and IR_FILTER registers. The
IR_FILTER value represents the spike filter pulse width, i.e all pulses less than the
IR_FILTER pulse width are considered spikes and not passed through to the signal
monitoring control.
Rev. 2 — 1 December 2004
Actual Sub-carrier Freq.
Programmed Freq.
50%
Chapter 8: General Purpose Input Output Pins
© Koninklijke Philips Electronics N.V. 2002-2003-2004. All rights reserved.
Actual Sub-carrier Freq.
Programmed Freq.
66%
PNX15xx Series
8-20