HL14104 View Datasheet(PDF) - Hyundai Micro Electronics

Part Name

Description

Manufacturer

HL14104

LCD Driver

Hyundai Micro Electronics 

10. Power On Reset

HL15604

1) Supply Voltage Detection ( SVD )

The SVD generates an output signal and results the system when power is

first applied and when the voltage drops. When the power supply voltage is

less than or equal to the power down detection voltage, which is 2.0V, typical.

To assure that this function operates reliably, a capacitor must be added to the

power supply voltage Vdd rise time when power is first applied and the power

supply voltage Vdd fall time when the voltage drops are both at least 1ms.

2) System Reset

If at least 1ms is assured as the supply voltage Vdd rise time when power is

applied, a system reset will be applied by the SVD output signal when the supply

voltage is brought up. If at least 1ms is assured as the supply voltage Vdd fall

time when power drops, a system reset will be applied in the same manner by

the SVD output signal when the supply voltage is lowered.

VDD

CE

Internal data

SVD

SVD

t1

t2

Display and control data transfer

Undefined

Defined

System reset period

Power supply voltage Vdd rise time : t1 > 1ms

Power supply voltage Vdd fall time : t2 > 1ms

3) Internal block states during the reset period

• Clock generator

Reset is applied and the base clock is stopped and OSC pin state is low.

• Common , segment drive and display data

Reset is applied and the display is turned off but display data is not cleared.

• Key scan

Reset is applied and all the key data is set to low.

18

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