Cirrus Logic CS1631 - Manual (Page 22)

CS1630/31
22 DS954F3
5.10.2 PLC Program Mode Characters
In order to program the CS1630/31, a set of encoded
characters is built from specific phase-cut waveform patterns.
Figure 24 illustrates the phase-cut waveform encoding
recognized by the CS1630/31 power line calibration system.
As shown in Table 1, six characters are formed using the
special character and two-bit encoded data.
5.10.3 Calibration Mode Operation Code
The CS1630/31 power line calibration system requires a start
and stop operation code to activate and deactivate power line
calibration mode. Once in the power line calibration mode,
operation codes (OPCODE) will be used to program specific
addresses using the OPCODE listed in Table 2.
The LED light flashes seven times to indicate a command
error. The LED flashes two times when OTP registers are
programmed successfully and four times when programming
is unsuccessful. Figure 25 illustrates an example of a power
line calibration mode command sequence and the cut-
waveform pattern.
Character Code Notes
Start Char (SC)00(SC) PLC Program Start Character (1)
Stop Char (SC)11(SC) PLC Program Stop Character (1)
Duo-bit ‘00’ 00 2-bit Data [00]
Duo-bit ‘01’ 01 2-bit Data [01]
Duo-bit ‘10’ 10 2-bit Data [10]
Duo bit ‘11’ 11 2-bit Data [11]
Note: (1) A Special Character (SC) must precede and follow the Duo-bit.
Table 1. Power Line Calibration Characters
90°
Special Char
‘11’
146°
‘01’
62°
‘10’
118°
‘00’
34°
90° 146° 90°
PLC Stop Char
90° 34° 90°
PLC Start Char
Figure 24. Power Line Calibration Mode Character Waveforms
PLC Start Character Addr Bcast
&
Simple Code
00
PLC Operation Code
(4-bit)
0000
Odd Parity
&
Don’t Care
10
PLC Stop Character Before Transmit After Transmit
135° 135° 135° 135° 90° 34° 90° 90° 146° 90° 34° 34° 118° 34°
Figure 25. Power Line Calibration Mode Example
Calibration Command Sequence
Start Char [(SC)00(SC)] Addr Bcast
&
Simple Code
[1 Duo-bit]
OPCODE
[2 Duo-bits]
Odd Parity
&
Don’t Care
[1 Duo-bit]
Stop Char [(SC)11(SC)]
Name OPCODE Description
NOP 0000 No Operation
INIT_PROG_MODE 0001 Initialize program mode (1)
I2C_WRITE 0010 Perform a generic I 2 C write
0011 Reserved
BURN_OTP 0100 Initiate an OTP write cycle (3)
STR1_OFFSET 0101 Write String 1 offset (2)
STR2_OFFSET 0110 Write String 2 offset (2)
WRITE_CRC 0111 Write CRC value
END_PROG_MODE 1000 Disable programming mode
WRITE_DIM 1001 Sets PLC dim value
Notes: (1) Allows other commands to program the device under test.
(2) Range of Offset tolerance is ±15%.
(3) The light is flashed to indicate pass or fail.
Table 2. Power Line Calibration Operation Code