CS1630 Datasheet, PDF (47/56 Pages) Cirrus Logic – 2-Channel TRIAC Dimmable LED Driver IC

CS1630/31
6.37 Configuration 55 (Config55) – Address 87
7
6
5
4
3
2
1
0
-
-
EOTP_FLP2 EOTP_FLP1 EOTP_FLP0 EOTP_SLP2 EOTP_SLP1 EOTP_SLP0
Number
Name
Description
[ 7:6]
-
Reserved
Sets time constant of the faster low pass filter used for filtering the coarse 8-bit
ADCR temperature measurements. This filter's output is used for external
overtemperature fault detection by quickly detecting if the external NTC tem-
perature has exceeded the temperature set point Temp_Shutdown. Its output is
also used by the Color Control System for controlling the color gain with tem-
perature for the temperature-dependent channel.
[5:3] EOTP_FLP[2:0]
000 = No filter
001 = 233ms
010 = 466ms
011 = 933ms
100 = 1.866s
101 = 3.733s
110 = Reserved
111 = Reserved
[2: 0 ]
Time constant of the slower low pass filter used for filtering the coarse ADCR
temperature measurements. It's output is used for the external overtempera-
ture protection (eOTP) dim with temperature feature which decreases the sec-
ond stage dim level once the temperature measured using the external NTC
connected to pin eOTP exceeds the temperature threshold set using eOTP,
Temp_eOTP (see “Configuration 59 (Config59) – Address 91” on page 48).
EOTP_SLP[2:0]
000 = 3.75s
001 = 7.5s
010 = 10s
011 = 15s
100 = 20s
101 = 30s
110 = 1min
111 = 2min
6.38 PLC Dim (PLC_DIM) – Address 89
7
6
5
4
3
2
1
0
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
PLC_DIM sets the second stage dim level while in PLC mode (see "Calibration Mode Operation Code" on
page 22) and Leading-edge Mode. The register value is an unsigned integer in the range of 0value255. The
dim value prevents flashing when a command is sent to the device. If PLC_DIM = 0x00 then 0x7F is used which
is equivalent to a 50% dim value. The 12-bit PLC dim value is given by:
PLC_DIM  16  + 15
DS954F2
47