AS3665 datasheet(50/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - Prog ramming Sequen ce r s

MUX tables - assignments of sequencers to channels

The MUX tables are setup during a program execution dynamically with the following sequencer commands:

- MUX set start address (see page 55) and MUX set end address (see page 56) define a memory region where the

MUX tables is operating (MUX next address or MUX previous address). MUX set start address automatically

loads the MUX for this sequencer with the content of the memory of ‘start address’.

- MUX next address (see page 56) and MUX previous address (see page 57) increase (or decrease) the MUX

pointer by one and load the MUX of this sequencer with the memory content the pointer is addressing. The MUX

pointer is kept within range defined by MUX set start address and MUX set end address.

- MUX set ptr (see page 58) sets the MUX pointer to a address defined by a displacement and MUX set start

address

- MUX select LED (see page 56) selects a single PWM output (single LED) where this sequencer is connected to.

This is useful for simple sequencer - PWM connections without requiring to setup a dedicated MUX table.

- MUX clear (see page 56) clears the MUX of this sequencer (no PWM channels are selected anymore).

The sequencer can operate in two operating modes:

1. PWM mode - this is the standard operating mode; the sequencer directly controls any of the PWM generators.

This is the default operating mode.

2. Ratiometric mode - the sequencer controls one or more of the faders (fader1 (see page 23), fader2 and/or

fader3). The fader can control general LED brightness (configurable to control any number of LEDs) - see Cur-

rent Sources (see page 15).

The ratiometric mode is entered with the command MUX set RM (see page 66) or MUX fade (see page 66). The

AS3665 returns to PWM mode with the command MUX reset RM.

The sequencer are connected to the PWM generators and faders according to Figure 28 (the 16 bits are the content of

the memory register, the MUX pointer is pointing to. A ‘1’ connects the sequencer to this output, a ‘0’ disconnects this

output):

Figure 28. MUX table connections

Variables

The AS3665 includes four variables ra, rb, rc and rd. These variables can read and written by the I

2C interface and in

parallel read and written by the sequencers

20. Using the variables, programs can be controlled by a single I2C com-

mands. Sequencers can use these variables for internal calculations, for communication between the sequencers and

to communicate to the I

2C controller.

18.The MUX tables share the same start address set by MUX set start address but have separate current

addresses and end addresses set by MUX set end address

19.Use only the highest (in order 1,2,3) sequencers for ratiometric mode (e.g. SEQ1 PWM, SEQ2 ratiometric

but not SEQ3 for PWM mode at the same time)

20.Variable rd is read/writable by I

2C but only readable by the sequencers.

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