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HT1626 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT1626 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
5 / 15 page Pad Description Pad No. Pad Name I/O Description 1 OSCI I The OSCI and OSCO pads are connected to a 32.768kHz crystal in order to generate a system clock. If the system clock comes from an external clock source, the external clock source should be connected to the OSCI pad. But if an on-chip RC oscillator is selected instead, the OSCI and OSCO pads can be left open. 2 OSCO O 3 VDD ¾ Positive power supply 4 VLCD I LCD operating voltage input pad. 5 IRQ O Time base or Watchdog Timer overflow flag, NMOS open drain output 6, 7 BZ, BZ O 2kHz or 4kHz tone frequency output pair 8~11 T1~T4 I Not connected 12~27 COM0~COM15 O LCD common outputs 28~75 SEG0~SEG47 O LCD segment outputs 76 CS I Chip selection input with pull-high resistor. When the CS is logic high, the data and command read from or write to the HT1626 are disabled. The se- rial interface circuit is also reset. But if the CS is at logic low level and is in- put to the CS pad, the data and command transmission between the host controller and the HT1626 are all enabled. 77 RD I READ clock input with pull-high resistor. Data in the RAM of the HT1626 are clocked out on the falling edge of the RD signal. The clocked out data will appear on the data line. The host controller can use the next rising edge to latch the clocked out data. 78 WR I WRITE clock input with pull-high resistor. Data on the DATA line are latched into the HT1626 on the rising edge of the WR signal. 79 DATA I/O Serial data input or output with pull-high resistor 80 VSS ¾ Negative power supply, ground Absolute Maximum Ratings Supply Voltage ......................................... -0.3V to 5.5V Storage Temperature ............................ -50°Cto125°C Input Voltage.............................VSS -0.3V to VDD+0.3V Operating Temperature........................... -25°Cto75°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil- ity. HT1626 Rev. 1.10 5 September 11, 2002 |
Similar Part No. - HT1626_02 |
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Similar Description - HT1626_02 |
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