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HT8656

Holtek Semiconductor
Part Number HT8656
Manufacturer Holtek Semiconductor
Description Talking Back
Published Jul 4, 2010
Detailed Description HT8656 Talking Back Features • • • www.DataSheet4U.com • • Operating voltage: 4.5V~5.5V ADM algorithm DRAM selection...
Datasheet PDF File HT8656 PDF File

HT8656
HT8656


Overview
HT8656 Talking Back Features • • • www.
DataSheet4U.
com • • Operating voltage: 4.
5V~5.
5V ADM algorithm DRAM selection: – 64K – 256K Sampling rate selection: – 32Kb – 16Kb Auto stop recording – 0.
5 seconds silence is detected – Recording capacity is full • • • • • • • Built-in 2-stage microphone amplifier Built-in DRAM refresh circuit Voltage type D/A output Current type D/A output Auto record and playback Auto power-off Low power consumption Applications • • Toys Education • Games General Description The HT8656 is a single chip CMOS LSI for talking back applications using an ADM algorithm.
Functions of the IC consist of recording/playing as well as auto power off.
It starts recording when a sound input is detected, and stops to play back when silence lasts 0.
5 seconds during recording.
The auto power off function is activated once a REC/PLAY cycle has been implemented 64 times or an interval of silence exceeds 2 minutes.
The HT8656 provides a recording capacity of 2 seconds for DRAM of 64K and 8 seconds for DRAM of 256K at a 32Kb sampling rate and double recording capacity at a 16Kb sampling rate.
A higher sampling rate will result in sounds of better quality but sacrifice the recording time, and vice versa.
1 5th May ’98 HT8656 www.
DataSheet4U.
com Pin Assignment Block Diagram 2 5th May ’98 HT8656 www.
DataSheet4U.
com Pad Coordinates Chip size: 3276.
6 × 3530.
6 (µm)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
Unit: µm Pad No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 X –1488.
19 –1488.
19 –1488.
19 –1488.
19 –1488.
19 –1488.
19 –1488.
19 –1488.
19 –1396.
75 –1170.
43 –964.
69 –399.
03 –145.
29 1033.
27 1239.
01 Y 1613.
92 1277.
87 906.
53 653.
80 –355.
60 –635.
51 –937.
26 –1378.
46 –1615.
19 –1615.
19 –1615.
19 –1615.
19 –1615.
19 –1615.
19 –1615.
19 Pad No.
16 17 18 10 20 21 22 23 24 25 26 27 28 29 X Y 1488.
19 –1615.
19 1488.
19 –377.
19 1488.
19 –124.
71 1488.
19 130.
30 1488.
19 384.
05 1488.
19 651.
51 1488.
19 1089.
41 1488.
19 1363.
73 1436.
88 1615.
19 122...


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