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ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 1 / 21 f eatures controlled by i 2 c interface 4 stereo inputs (including 1 quasi-differential input) with selectable input gain 2 channels electronic volume +15 to -79db with 1db/step 1 subwoofer output: +15 to -79db with 1db/step adjustable crossover frequency for subwoofer tone control (bass and treble): -15 to +15db, 1db/step input gain control: 0 to +15db, 1db/step loudness: 0 to -15db, 1db/step 4 independent speaker outputs: +15 to -79db with 1db/step & independent programmable mix input with 50% mixing ratio for front speakers low distortion and low noise lqfp44 package application car audio description the zl 3459 is a 4.1ch audio processor designed for car audio purpose. using i2c interface controls all of the functions. like most of audio processor, it equipped up to 4 stereo sources input with adjustable gain, master volume with adaptive loudness, treble and bass tone control. in a car entertainment system needs front and rear seat individual control, the zl 3459 provides separate input source selection and output volume adjust ; a special design mixing amp is very easy combine the navigation system or cellular phone s voice into the car audio system. block diagram
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 2 / 21 pin configuration pin description
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 3 / 21 a bsolute maximum ratings electrical characteristics (unless specified: ta=25 , vcc=9v, rl=10k , rg = 40 , all controls flat (g=0), f=1khz)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 4 / 21
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 5 / 21 application circuit
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 6 / 21 function descriptions input multiplexer the ZL3459 provides pseudo-differential stereo input and single-ended stereo input, the pseudo differential input also could configured as single-ended input 4th, in this configuration the diffg pin is no connection. output multiplexer pin 31 is bi-direction function, if d5 of data-byte 03h is 0 the pin 31 will becomes an input pin, an auxiliary source (such navigation system or cellular phone) can be mix with front channel output. otherwise d5=1 the pin 31 will outputs subwoofer signal. the rear output signal is flexible from second sources selector or sync with front channel signal. each channel s output level can be controlled from +15db to -79db and individually, it is well to be the balance and fader control.
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 7 / 21 subwoofer filter built-in mono-mixer (with 50% mixture ratio) would mix both front channel outputs to sout and coupling with a capacitor to sin, the subwoofer filter input. it is a 2nd order low pass filter with programmable cut off frequency, there have 3 cut off frequencies could be choosing: 80hz, 120hz and 160hz, the output level of subwoofer filter is from +15db to -79db with 1db step resolution. volume, loudness and tone control master volume controller is similar to others, provides from +15db to -79db range with 1db step resolution; the loudness block is a 1st order filter configuration behind the volume output, provides 15db gain with 1db step resolution to boost up the bass response, in the flat mode is will performs as a ordinary attenuator. the bass and treble corner frequency is on the 100hz and 10khz, provides 15db gain and 1db step resolution. control bus specification bus interface all functions of the ZL3459 are controlled by the i2c interface, the interface is consisting by sda and scl pins. detail protocol of the i2c bus will discuss on the next section. it should be noted that the bus level pull-up resistors connected to the ZL3459 positive supply voltage may required in some application especially the mcu output high level is no
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 8 / 21 enough. data validity a data on the sda line is considered valid and stable only when the scl signal is in high state. the high and low state of the sda line can only change when the scl signal is low. please refer to the figure below. start and stop conditions a start condition is activated when 1) the scl is set to high and 2) sda shifts from high to low state. the stop condition is activated when 1) scl is set to high and 2) sda shifts from low to high state. please refer to the timing diagram below. byte format every byte transmitted to the sda line consists of 8 bits. each byte must be followed by an acknowledge bit. the msb is first transmitted. acknowledge during the acknowledge clock pulse (ack), the sda output port of the master device ( p) would be sets on hi-z state, if peripheral device (ex: audio processor) recognize the i2c command the sda line will be pull-down by slave device during the scl clock pulse held in high state period. please refer to the diagram below. the slave device that has been addressed to generate an acknowledge after receiving each byte, otherwise, the sda line will remain at the high level in period of the ninth (9th) clock pulse. in this case, the host controller will generate a stop sign in order to abort the transfer mission.
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 9 / 21 transmission without acknowledge if the application does not need to verify the acknowledge signal that generated by the slave device is right or not, host controller can just bypass the acknowledge check and transmit next data byte to the slave device. if this approach is used, there are greater chances of faulty operation as well as decrease in noise immunity. interface protocol the interface protocol sequence was defined in below section: ? a start sign. ? a chip address of the desire slave device. the w bit must be 0 (written). the ZL3459 will always response an acknowledge on the end of each byte. ? a data sequence (n-bytes + acknowledge) ? a stop condition data rate the ZL3459 support standard-mode (100kbit/s) i2c data rate in all operation condition, in specified condition it also support fast-mode (400kbit/s) i2c data rate, please refer to the follow table: mcu level ZL3459 vdd voltage 4v 5v 6v 7v 8v 9v 10v 2.5v f f x x x x x 3.3v f f f f s s x 5v x f f f f f f notes: 1. x = not allow in this combination, s = standard mode supported, f = fast mode supported. 2. data rate specification is design guarantee and exams in test bench only, not fully tested in final production.
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 10 / 21 i2c bus initial time the ZL3459 is controlled by the i2c bus command; each time the supply voltage applied to chip it needs an initial time to reset all of the internal decoder register, in this period access the i2c bus is prohibited. the initial time is determinate by capacitance it attached on cref pin and td. for proper operation user must check the i2c starts timing is fit this requirement and recommended td timing shown on next page is 50ms. software specification ZL3459 chip address the ZL3459 chip address is 88h and binary table is shown on below. sub address table
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 11 / 21 data table description main input selector/input gain(ooh)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 12 / 21 loudness/subwoofer(01h)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 13 / 21 volume (02h)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 14 / 21 bass/mix1/mix2/mix(03h) note: mixing enable off means pin 31 as 2nd subwoofer output.
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 15 / 21 treble (04h)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 16 / 21 mixinglevel (05h)/speaker a ttenuator leftfront (06h) /rightfront (07h) /leftrear (08h)/rightrear (09h) /subwoofer (10h)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 17 / 21 second input selector /input gain (11h)
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 18 / 21 typical performance characteristics
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 19 / 21
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 20 / 21
ZL3459 4.1-channel audio processor with subwoofer ver:1.0 www.zlmicro.com 21 / 21 package information lqfp44

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