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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT1621 датащи(PDF) 6 Page - Holtek Semiconductor Inc |
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HT1621 датащи(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 19 page  A.C. Characteristics Ta=25 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSYS1 System Clock ¾ On-chip RC oscillator ¾ 256 ¾ kHz fSYS2 System Clock ¾ Crystal oscillator ¾ 32.768 ¾ kHz fSYS3 System Clock ¾ External clock source ¾ 256 ¾ kHz fLCD LCD Clock ¾ On-chip RC oscillator ¾ fSYS1/1024 ¾ Hz ¾ Crystal oscillator ¾ fSYS2/128 ¾ Hz ¾ External clock source ¾ fSYS3/1024 ¾ Hz tCOM LCD Common Period ¾ n: Number of COM ¾ n/fLCD ¾ s fCLK1 Serial Data Clock (WR pin) 3V Duty cycle 50% 4 ¾ 150 kHz 5V 4 ¾ 300 kHz fCLK2 Serial Data Clock (RD pin) 3V Duty cycle 50% ¾¾ 75 kHz 5V ¾¾ 150 kHz fTONE Tone Frequency ¾ On-chip RC oscillator ¾ 2.0 or 4.0 ¾ kHz tCS Serial Interface Reset Pulse Width (Figure 3) ¾ CS ¾ 250 ¾ ns tCLK WR,RD Input Pulse Width (Figure 1) 3V Write mode 3.34 ¾ 125 ms Read mode 6.67 ¾¾ 5V Write mode 1.67 ¾ 125 ms Read mode 3.34 ¾¾ tr,tf Rise/Fall Time Serial Data Clock Width (Figure 1) ¾¾ ¾ 120 ¾ ns tsu Setup Time for DATA to WR, RD Clock Width (Figure 2) ¾¾ ¾ 120 ¾ ns th Hold Time for DATA to WR,RD Clock Width (Figure 2) ¾¾ ¾ 120 ¾ ns tsu1 Setup Time for CS to WR,RD Clock Width (Figure 3) ¾¾ ¾ 100 ¾ ns th1 Hold Time for CS to WR,RD Clock Width (Figure 3) ¾¾ ¾ 100 ¾ ns HT1621 Rev. 1.70 6 June 29, 2005 C S G N D 5 0 % 5 0 % F i r s t C l o c k L a s t C l o c k G N D W R , R D C l o c k t S U 1 t h 1 t C S V D D V D D Figure 3 9 0 % 5 0 % 1 0 % G N D W R , R D C l o c k t f t r t C L K t C L K V D D Figure 1 5 0 % V a l i d D a t a 5 0 % D B W R , R D C l o c k G N D G N D t h t S U V D D V D D Figure 2 |
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