VSC060 datasheet(91/166 Pages) MAXIM

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VSC060

Data Sheet

Revision 4.1

January 2008

3.2.95 76h: Pulse Train Control 30 (PTC30)

This register, along with the PTC31 register, provides a user-programmable LED flashing pulse train. The

user can adjust the pulse duration, the pulse train length, and the on/off time to derive a specific visual

indication. The PTC30 register provides eight of the twelve bits available in the programmable pulse train.

The PTC31 register contains two bits of pulse-width programmability, two bits of pulse train length

programmability, and the remaining four bits of the programmable pulse train.

As an example, the pulse train can be used to develop a visual heartbeat indication by programming the

PTC30 register with a 45h and the PTC31 register with a C1h. This combination develops a pulse train

with two blinks followed by a gap with the on times of the LED equal to 125 ms.

If the default values of this register or the PTC31 register are modified, synchronization to LED flash rates

programmed in other VSC060 devices is disabled.

The following table shows the bit assignments for the Pulse Train Control 30 register.

PTC30

Address:

76h

Reset Value:

0000_0000b

Bit

Bit Label

Access

Description

7:0

PT7-0

R/W

Pulse Train

These eight bits are the first bits shifted out from 0 to 7 and define the on/off

time for the flash rate.

1: defines LED on time.

0: defines LED off time.

VSC060 Datasheet(PDF) 91 Page - Maxim Integrated Products