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6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 1 updated july 2000 description pt2258 is a 6-channel electronic volume controller ic utilizing cmos technology specially designed for the new generation of av multi-channel audio system. pt2258 provides an i 2 c control interface, an attenuation range of 0 to -79 db at 1 db/step, low noise, high channel separation. housed in 20-pin, dip or so package, pt2258s pin assignments and application circuit are optimized for easy pcb layout and cost saving advantages. features ? cmos technology ? low power consumption ? least external components ? attenuation range: 0 to -79 db at 1db/step ? operating voltage: 5 to 9 v ? low noise, s/n ratio>100db (a-weighting) ? high channel separation ?i 2 c bus control interface ? selectable address ? 6-channel outputs ? available in 20-pin, dip or so package applications ? av surround audio equipment ? car audio ? mini compo ? computer multi-media speaker ? other audio equipments
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 2 updated july 2000 block diagram 1db /ste p 1db /ste p 1db /ste p 1db /ste p 1db /ste p 1db /ste p
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 3 updated july 2000 pin configuration in 1 in 2 in 3 out1 out4 out2 out5 out3 out6 scl ref sda code2 code1 gnd dgnd vcc 1 20 2 19 3 18 417 813 10 11 714 9 12 6 15 5 16 pt2258 in 4 in 5 in 6
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 4 updated july 2000 pin description pin name i/o description pin no. in1 i channel input no. 1. 1 connect a capacitor to audio source in2 i channel input no. 2 2 connect a capacitor to audio source in3 i channel input no. 3 3 connect a capacitor to audio source code2 - refer to address code section 4 dgnd - digital ground 5 scl i i 2 c clock input 6 sda i i 2 c data input 7 in4 i channel input no. 4 8 connect a capacitor to audio source in5 i channel input no. 5 9 connect a capacitor to audio source in6 i channel input no. 6 10 connect a capacitor to audio source out6 o channel output no. 6 11 connect a capacitor to the next stage out5 o channel output no. 5 12 connect a capacitor to the next stage out4 o channel output no. 4 13 connect a capacitor to the next stage gnd - ground 14 ref - reference voltage= 1/2 vcc 15 connect a capacitor to the ground vcc - power supply input 16 code1 - refer to the address code section 17 out3 o channel output no. 3 18 connect a capacitor to the next stage out2 o channel output no. 2 19 connect a capacitor to the next stage out1 o channel output no. 1 20 connect a capacitor to the next stage
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 5 updated july 2000 functional description bus interface data are transmitted to and from the microprocessor to the pt2258 via the sda and scl. the sda and scl make up the bus interface. it should be noted that the pull-up resistors must be connected to the positive supply voltage. 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 states of the sda line can only change when the scl signal is low. please refer to the figure below. sda scl 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. scl sda
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 6 updated july 2000 byte format every byte transmitted to the sda line consists of 8 bits. each byte must be followed by an acknowl- edge bit. the msb is transmitted first. acknowledge during the acknowledge clock pulse, the master (p) puts a resistive high level on the sda line. the peripheral (audio processor) that acknowledges has to pull-down (low) the sda line during the acknowledge clock pulse so that the sda line is in a stable low state during this clock pulse. please refer to the diagram below. the audio processor that has been addressed has to generate an acknowledge after receiving each byte, otherwise, the sda line will remain at the high level during the ninth (9th) clock pulse. in this case, the master transmitter can generate the stop information in order to abort the transfer. transmission without acknowledge if you want to avoid the acknowledge detection of the audio processor, a simpler p transmission may be used. wait one clock and do not check the slave acknowledge of this same clock then send the new data. if you use this approach, there are greater chances of faulty operation as well as decrease in noise immunity.
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 7 updated july 2000 interface protocol the interface protocol consists of the following: a start condition a chip address byte including the pt2258 address. the 8 th bit of the byte must be 0. pt2258 must always acknowledge the end of each transmitted byte. a data sequence (n-bytes + acknowledge) a stop condition please refer to the diagram below: software specification pt2258 address code pt2258 address code depends on the state of code1 (pin no. 17) and code2 (pin no.4). if code1 or code2 is connected to vcc, then code1 or code2 is set to 1. if code1 or code2 is con- nected to the ground, it is set to 0. please refer to the information below: condition 1: when code1=1 and code2=1: pt2258 address code1 code2 11 then, the pt2258 address code is (8ch): 100 011 00 msb lsb
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 8 updated july 2000 code1 code2 10 then, the pt2258 address code is (88h): condition 2: when code1=1 and code2=0: code1 code2 01 then, the pt2258 address code is (84h): condition 3: when code1=0 and code2=1: code1 code2 00 then, the pt2258 address code is (80h): condition 4: when code1=0 and code2=0: 100 010 00 msb lsb 100 001 00 msb lsb 100 000 00 msb lsb
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 9 updated july 2000 data bytes description function bits msb lsb function 1 1 1 0 a3 a2 a1 a0 6-channel, -1db/step 1 1 0 1 0 b2 b1 b0 6-channel, -10db/step 0 0 0 1 a3 a2 a1 a0 channel no. 3, -1db/step 0 0 0 0 0 b2 b1 b0 channel no. 3, -10db/step 0 0 1 1 a3 a2 a1 a0 channel no. 4, -1db/step 0 0 1 0 0 b2 b1 b0 channel no. 4, -10db/step 0 1 0 1 a3 a2 a1 a0 channel no. 2, -1db/step 0 1 0 0 0 b2 b1 b0 channel no. 2, -10db/step 0 1 1 1 a3 a2 a1 a0 channel no. 5, -1db/step 0 1 1 0 0 b2 b1 b0 channel no. 5, -10db/step 1 0 0 1 a3 a2 a1 a0 channel no. 1, -1db/step 1 0 0 0 0 b2 b1 b0 channel no. 1, -10db/step 1 0 1 1 a3 a2 a1 a0 channel no. 6, -1db/step 1 0 1 0 0 b2 b1 b0 channel no. 6, -10db/step 1 1 1 1 1 0 0 m 6-channel, mute when m=1, mute=on when m=0, mute=off
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 10 updated july 2000 attenuation unit bit where: ax=-1db/step, bx=-10db/step a3/--- a2/b2 a1/b1 a0/b0 attenuation value (db) 00 00 0/0 0 0 0 1 -1/-10 0 0 1 0 -2/-20 0 0 1 1 -3/-30 0 1 0 0 -4/-40 0 1 0 1 -5/-50 0 1 1 0 -6/-60 0 1 1 1 -7/-70 1 0 0 0 -8/--- 1 0 0 1 -9/--- absolute maximum rating symbol parameter rating unit vs supply voltage 12 v tamb ambient temperature -20 to +75 o c tstg storage temperature -40 to +125 o c
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 11 updated july 2000 electrical characteristics symbol parameter condition min. typ. max. unit v dd supply voltage 5 9 10 v is supply current 8 ma r in input impedance fl,fr,ctr 27 30 35 k w sub,sl,sr v cl maximum input voltage volume=0db 2.8 3.0 vrms thd=1% sc channel separation 90 100 110 db c range volume control 79 db range a vmax maximum attenuation -79 db astep attenuation step 1 db ea attenuation error volume=0~-50db -1.0 0 +1.0 db a mute mute attenuation a-weighting 90 95 98 db thd total harmonic volume=0db 0.003 0.005 0.01 % distortion input,200mvrms noise output noise a-weighting 3 5 v s/n signal-to-noise ratio 0db=1vrms 100 105 110 db a-weighting ro output impedance 600 900 w go output gain -0.5 0 +0.5 db vomax maximum output fl,fr,center 2.3 2.6 2.9 vrms sub,sl,sr thd=1% i 2 c bus section electrical characteristics symbol parameter condition min. typ. max. unit v il bus low input level 2.4 2.5 v v ih bus high input level 2.8 3.0 v t init bus initialization cref=10f 250 300 ms
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 12 updated july 2000 application circuit in 1 in 4 out1 out4 out2 out5 out3 out6 in 2 in 5 in 3 in 6 scl ref sda code2 code1 gnd dgnd vcc vcc pt2258 120 2 19 3 18 4 17 8 13 10 11 714 9 12 6 15 5 16 + + + + + + + + + + + + + + 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 10uf 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k mcu ic bus 2 address=88hex dgnd agnd cref output in pu t order information valid part number package type pt2258 20 pins, dip package (300 mil) PT2258-S 20 pins, so package (300 mil)
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 13 updated july 2000 package information 20-pin, dip package (300 mil) symbols dimensions in inches min. nom. max. a 0.210 a1 0.015 a2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 d 0.980 1.030 1.060 d1 0.005 e 0.300 0.310 0.325 e1 0.240 0.250 0.280 e 0.100 bsc ea 0.300 bsc. eb 0.430 ec 0.000 0.060 l 0.115 0.130 0.150
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 14 updated july 2000 notes: 1. all dimensions are in inches. 2. dimensioning and tolerancing per ansi y14.5m-1982. 3. dimension a, a1 and l are measured with the package seated in jedec seating plane gauge gs-3 4. d, d1 and e1 dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch. 5. e and ea measured with the leads constrained to be perpendicular to datum -c- . 6. eb and ec are measured at the lead tips with the leads unconstrained. 7. n is the number of terminal positions (n=20) 8. pointed or rounded lead tips are preferred to ease insertion. 9. b2 and b3 maximum dimensions are not include dambar protrusions. dambar protrusions shall not exceed 0.010 inch (0.25mm). 10. distance between leads including dambar protrusions to be 0.005 inch minimum. 11. datum plane -h- coincident with the bottom of lead, where lead exits body. 12. refer to jedec ms-001, variation ad.
6-channel electronic volume controller ic preliminary pt2258 princeton technology corp. tel : 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 pre1.0 15 updated july 2000 20-pin, so package (300 mil) symbols dimensions in millimeter min. nom. max. a 2.35 2.65 a1 0.10 0.30 b 0.33 0.51 c 0.23 0.32 d 12.60 13.00 e 7.40 7.60 e 1.27 bsc. h 10.00 10.65 h 0.25 0.75 l 0.40 1.27 a 0 o 8 o notes: 1. dimensioning and tolerancing per ansi y14.5-1982. 2. dimension d does not include mold flash , protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 0.15mm (0.006 in) per side. 3. dimension e does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. the chamfer on the body is optional. it is not present, a visual index feature must be located within the crosshatched area. 5. l is the length of the terminal for soldering to a substrate. 6. n is the number of terminal positions. (n=20) 7. the lead width b as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. controlling dimension: millimeter. 9. refer to jedec ms-013 variation ac

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