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EN6370B Datasheet(PDF) 27 Page - Sanyo Semicon Device

Part No. EN6370B
Description  LCD Display Driver with Key Input Function
Download  38 Pages
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

EN6370B Datasheet(HTML) 27 Page - Sanyo Semicon Device

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LC75808W
No.6370-27/38
Voltage Detection Type Reset Circuit (VDET)
This circuit generates an output signal and resets the system when logic block power is first applied and when the
voltage drops, i.e., when the logic block power supply voltage is less than or equal to the power down detection voltage
VDET, which is 3.0V, typical. To assure that this function operates reliably, a capacitor must be added to the logic
block power supply line so that the logic block power supply voltage VDD rise time when the logic block power is first
applied and the logic block power supply voltage VDD fall time when the voltage drops are both at least 1 ms. (See
Figure 3, 4, and 5.)
Power Supply Sequence
The following sequences must be observed when power is turned on and off. (See Figure 3, 4, and 5.)
• Power on: Logic block power supply(VDD) on → LCD driver block power supply(VLCD) on
• Power off: LCD driver block power supply(VLCD) off → Logic block power supply(VDD) off
However, if the logic and LCD driver blocks use a shared power supply, then the power supplies can be turned on and
off at the same time.
System Reset
1. Reset Function
The LC75808W performs a system reset with the VDET. When a system reset is applied, the display is turned off,
key scanning is disabled, the key data is reset, and the general-purpose output ports are set to and held at the low
level (VSS). These states that are created as a result of the system reset can be cleared by executing the instruction
described below. (See figure 3, 4, and 5.)
• Clearing the display off state
Transferring all the serial data (the display data and the control data) creates a state in which the display is turned on.
• Clearing the key scan disabled and key data reset states
Transferring the control data not only creates a state in which key scanning can be performed, but also clears the key
data reset.
• Clearing the general-purpose output ports locked at the low level (VSS) state
Transferring the control data clears the general-purpose output ports locked at the low level (VSS) state and sets the
states of the general-purpose output ports.
• 1/8 duty
• t1
≥ 1 [ms] (Logic block power supply voltage VDD rise time)
• t2
≥ 0
• t3
≥ 0
• t4
≥ 1 [ms] (Logic block power supply voltage VDD fall time)
Figure 3
t1 t2
t4
t3
VDET
VIL
VDET
Defined
Undefined
Undefined
Undefined
Internal data (D1 to D120)
Internal data (D121 to D240)
Internal data (D241 to D360)
Internal data (D361 to D480)
Key scan
General-purpose output ports
Display state
Defined
Undefined
Undefined
Defined
Undefined
Undefined
Defined
Undefined
Undefined
Defined
Display on
Display off
Undefined
Disabled
Execution enabled
CE
A12918
Internal data
KC1 to KC6, PC1 to PC4,
CT0 to CT3, CTC,
SC, SP, DT1, DT2
VDD
VLCD
Fixed at the low level (VSS)
Can be set to either the high (VDD) or low (VSS) level.


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