HT1670 Ver la hoja de datos (PDF) - Holtek Semiconductor

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Lista de partido

HT1670

128x32 LCD Controller for I/O MCU

Holtek Semiconductor 

PATENTED

HT1670

Pad Description

Pad No.

Pad Name

1~42

96~181

SEG86~SEG127

SEG0~SEG85

43~58

80~95

COM31~COM16

COM0~COM15

59

CS

60

RD

61

62~65

66

WR

DB0~DB3

VSS

67

OSCI

68

OSCO

69

70, 79

71

72, 73

74~78

VDD

VLCD

IRQ

BZ, BZ

T1~T4, T000

I/O

Description

O LCD segment outputs

LCD common outputs, under 144´16 command mode, COM16~COM31 will

O share to SEG128~SEG143. COM31/SEG128, COM30/SEG129, COM29/

SEG130....., COM18/SEG141, COM17/SEG142, COM16/SEG143

Chip selection input with pull-high resistor. When the CS is logic high, the

data and command read from or write to the HT1670 are disabled. The serial

I interface circuit is also reset. But if the CS is at a logic low level and is input to

the CS pad, the data and command transmission between the host controller

and the HT1670 are all enabled.

READ clock input with pull-high resistor. Data in the RAM of the HT1670 are

I

clocked out on the falling edge of the RD signal. The clocked out data will ap-

pear on the data line. The host controller can use the next rising edge to latch

the clocked out data.

I

WRITE clock input with pull-high resistor. Data on the DATA line are latched

into the HT1670 on the rising edge of the WR signal.

I/O Parallel data input/output with a pull-high resistor

¾ Negative power supply for logic circuit, ground

The OSCI and OSCO pads are connected to a 32.768kHz crystal in order to

I

O

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, the OSCI and OSCO pads can be left

open.

¾ Positive power supply for logic circuit

I Power supply for LCD driver circuit

O Time base or Watchdog Timer overflow flag, NMOS open drain output.

O 2kHz or 4kHz frequency output pair (tristate output buffer)

I

Vary bias current pin

It is usually not connected

Absolute Maximum Ratings

Supply Voltage ...........................VSS-0.3V to VSS+5.5V

Input Voltage.............................VSS-0.3V to VDD+0.3V

Storage Temperature ............................-50°C to 125°C

Operating Temperature...........................-25°C to 75°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 reliability.

Rev. 1.60

5

November 9, 2010

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