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1.1 JST916 ????? 12bit ??? e ??s a r a d c a d c ????? 125khz?? 2.7v 5v?vref??? 1v vcc ? vref ? adc ???l???? e ? ?? 3.3vv ref 2.5v? 2mhz? shutdown ????? power-down ????????1?? 0.5uw???? ?? 8bit 12bit 8bit ???? 2 ? ??????? pda???? 1.2 ??? JST916 ?? JST916 ??? JST916 ??t ? ?? ?? ? a j u s t i c e 1
1.2.1 ? ? 1 +vcc ?2.7v5v 2 x+ x+?adc ? 1 3 y+ y+?adc ? 2 4 x- x- 5 y- y- 6 gnd ? 7 in3 1adc ? 3 8 in4 2adc ? 4 9 vref ? 10 +vcc ?2.7v5v 11 penirq ?? 10k100k h 12 dout ?????cs ? 13 busy busy ?cs ? 14 din ?cs ??? 15 cs ?????????? 16 dclk ??? sar ??? 1.3 ? ? ????? x ?? 300?y ?? 600? ?? 0.6n-1n? 0v-vcc?? 320x240 JST916 ?????? adc cdac? sar ? ?? ???? ???? sar ??? ??cdac ??????? x+y+in3in4 ?x+ y+??? xy ?in3in4 ???????? ???sar e a/d ? ?y?? saradc ? ? ????? ??????sar ??????? ?p??? 1.3.1 ? ?????? dsp ?????? 3 8 ? ? 8 ? 8 din ?? multiplexerswitch ? ? vref ?????3 ?????? 12 ? ??????????? 8 ? bit 7 (msb) bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 (lsb) s a2 a1 a0 mode ser/dfr pd1 pd0 JST916 ??t ? ?? ?? ? a j u s t i c e 2
1.????digctr ? ? ??? ? ? ? sarcapswitch biascompare analoginput?? ?? / clk ?? rstb ??? csb ???? din busy ? ??? dout ? 2.???sar ? ? ?? dac ??? ? ??? ? ?? ?? / clk ?? rstb ??? ?? ?? ? 5 ???? 8 ?????? ????? ???c_swn??? ??? ad ??????????? msb lsb ??????? 1/2 n vref ?? comp ??? bn JST916 ??t ? ?? ?? ? a j u s t i c e 3
?c_swn ? ad_data bn ? ??rstb ???????? ? 12bit ? mode=1 8bit ??????? 12bit ?????^ 3.??analoginput ? ? ??? ? ?????? ?? / in3 ?? in4 ? ref ?? x+ x ? x- x ? y+ y ? y- y ? ?? ?? ? ? ? mos ? JST916 ??t ? ?? ?? ? a j u s t i c e 4
1 ????? a) auto-power-down full-power ?????auto-power-do wn ??pd1=0????? ????? full-powerpd1=1????????? ??????????? b) single-ended mode differential mode ????? ?single-ended ??????? ? vref gnd different ial ?????? x+ x- y+ y- ??? vcc gnd?????? ?????? single-ended mode differential mode c) penirq enable penirq disenable penirq ?????????? JST916 ??t ? ?? ?? ? a j u s t i c e 5
i/o1i/o2 ??? i/o1 ??i/o2 ???? i/o1 ??JST916 y-??? i/o2 ???? sleep down ?? ?? s1 ?? penirqx+y-gnd ????i/o2 ???????? sleep down ????? JST916 ???????y-??????? ? penirq ??????? penirq ??? 16clock per cycle 15clock per cycle 1.3.2 ?? 1. ?? 1) ???????????? ??? 5? 2) ? ?????? ser/dfr ? vref ? 2.cdac ?? 1) ??? dac??sar????? ???? JST916 ??t ? ?? ?? ? a j u s t i c e 6
2) ????? 3) ? cdac ???single-ended d ifferential mode?? ? ref ???single ?? ref vref gnddifferential ?? ref y+y- x+x- d ifferential ????????? 3.? ?? 1) ?? adc ???? adc 12 ? e ? ref 2.5v???? 2.5/4096=610uv ??? ?????? lsb/4 ?? 152uv???? ?? 152uv adc ?????? 1 ??? ?????? e ?? ? 2mhz?? ? ? 250ns 2) ? adc ???? ??????? ^?? ??e power down ? p ower down ?? ?? ?? ? ?? ??? ?? power down e e ? ??? 4.?y ??????? ?????reset ?????? 5us reset ???? JST916 ??t ? ?? ?? ? a j u s t i c e 7

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