MAX14521E Datasheet, PDF (14/20 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

Quad, High-Voltage EL Lamp Driver
with I²C Interface
Audio Input Register (0x05)
Frequency and Amplitude Modulation (FR_AM)
0 = AUX input signal modulates EL output voltage.
1 = AUX input frequency modulates EL output frequency.
AUX Envelope on EL Output (NO_SAMPLE)
1 = The EL output envelope follows that of the AUX
envelope.
0 = AUX is sampled every f_EL cycle and the corre-
sponding EL output cycle has zero DC average.
Set FR_AM = 0 when NO_SAMPLE = 1 and enable the
corresponding EL outputs by bits AU[4:1]. If FR_AM =
1, the NO_SAMPLE bit has no effect. If AUX is a DC
value, the EL output peak-to-peak voltage is EL_ (V_P-P)
= 250 x AUX (V) with a maximum of 300V_P-P. If AUX is a
PWM signal with a frequency from 100kHz to 10MHz,
the EL output voltage is V_EL = 300 x DutyCycle% (V_P-P).
Table 10. Boost-Converter Frequency Range
FSW3
FSW2
FSW1
FSW0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
BOOST-CONVERTER SWITCHING FREQUENCY (kHz)
FSW4 = 0
FSW4 = 1
800
400
853
427
907
453
960
480
1013
507
1067
533
1120
560
1173
587
1227
613
1280
640
1333
667
1387
693
1440
720
1493
747
1547
773
1600
800
Table 11. Audio Input Configurations
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
0x05
FR_AM
NO_
SAMPLE
AUXDIV1
AUXDIV0
AU4
AU3
AU2
AU1
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