Datasheet LC75852W, LC75852E Datasheet (SANYO)

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Page 1

CMOS LSI

Ordering number : EN4828A

63096HA (OT)/N1594TH (OT) B8-1326, 1328 No. 4828-1/16

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

Asynchronous Silicon Gate 1/2 Duty LCD Driver

with On-Chip Key Input Function

LC75852E, 75852W

Overview

The LC75852E and LC75852W are 1/2 duty dynamic LCD display drivers. In addition to being able to directly drive LCD panels with up to 90 segments, they can also control up to four general-purpose output ports. These products also include a key scan circuit which allows them to accept input from keypads with up to 30 keys. This allows end product front panel wiring to be simplified.

Features

• Up to 30 key inputs (Key scan is only performed when a key is pressed.)

• 1/2 duty – 1/2 bias (up to 90 segments)

• Sleep mode and the all segments off function can be controlled from serial data.

• Segment output port/general-purpose output port usage can be controlled from serial data.

• Serial data I/O supports CCB format communication with the system controller.

• High generality since display data is displayed directly without decoder intervention

• Reset pin that can establish the initial state.

Package Dimensions

unit: mm

3159-QFP64E

unit: mm

3190-SQFP64

Specifications

Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

max V

–0.3 to +7.0 V

Input voltage V

OSC, CE, CL, DI, RES, KI1 to KI5 –0.3 to VDD+ 0.3 V

Output voltage V

OUT

OSC, DO, S1 to S45, COM1, COM2, KS1 to KS6, P1 to P4 –0.3 to VDD+ 0.3 V

OUT

1 S1 to S45 100 µA

Output current I

OUT

2 COM1, COM2, KS1 to KS6 1 mA

OUT

3 P1 to P4 5 mA Allowable power dissipation Pd max Ta = 85°C 200 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –55 to +125 °C

• CCB is a trademark of SANYO ELECTRIC CO., LTD.

• CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.

[LC75852E]

SANYO: QIP64E

SANYO: SQFP64

[LC75852W]

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Allowable Operating Ranges at Ta = –40 to +85°C, VSS= 0 V

Note: * Since DO is an open-drain output, these values differ depending on the pull-up resistor RPUand the load capacitance CL.

Electrical Characteristics in the Allowable Operating Ranges

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Parameter Symbol Conditions min typ max Unit

Supply voltage V

4.5 6.0 V

Input high-level voltage

1 CE, CL, DI, RES 0.8 V

2 KI1 to KI5 0.6 V

Input low-level voltage V

CE, CL, DI, RES, KI1 to KI5 0 0.2 V

Recommended external

OSC

OSC 62 kΩ

resistance Recommended external

OSC

OSC 680 pF

capacitance Guaranteed oscillator range f

OSC

OSC 25 50 100 kHz

Data setup time t

CL, DI: Figure 1 160 ns

Data hold time t

CL, DI: Figure 1 160 ns

CE wait time t

CE, CL: Figure 1 160 ns

CE setup time t

CE, CL: Figure 1 160 ns

CE hold time t

CE, CL: Figure 1 160 ns

High-level clock pulse width t

øH

CL: Figure 1 160 ns

Low-level clock pulse width t

øL

CL: Figure 1 160 ns

Rise time t

CE, CL, DI: Figure 1 160 ns

Fall time t

CE, CL, DI: Figure 1 160 ns

DO output delay time t

DO, RPU= 4.7 kΩ, CL= 10 pF*: Figure 1 1.5 µs

DO rise time t

DO, RPU= 4.7 kΩ, CL= 10 pF*: Figure 1 1.5 µs

RES switching time t2 Figure 2 10 µs

Parameter Symbol Conditions min typ max Unit

Hysteresis V

CE, CL, DI, RES, KI1 to KI5 0.1 V

Input high-level current I

CE, CL, DI, RES: VI= 6.0 V 5.0 µA

Input low-level current I

CE, CL, DI, RES: VI= 0 V –5.0 µA

Input floating voltage V

KI1 to KI5 0.05 V

Pull-down resistance R

KI1 to KI5: VDD= 5.0 V 50 100 250 kΩ

Output off leakage current I

OFFH

DO: VO= 6.0 V 6.0 µA

1 KS1 to KS6: IO= –1 mA VDD– 1.0 V

Output high-level voltage

2 P1 to P4: IO= –1 mA VDD– 1.0 V

3 S1 to S45: IO= –10 µA VDD– 1.0 V

4 COM1, COM2: IO= –100 µA VDD– 0.6 V

1 KS1 to KS6: IO= 50 µA 0.4 1.0 3.0 V

2 P1 to P4: IO= 1 mA 1.0 V

Output low-level voltage V

3 S1 to S45: IO= 10 µA 1.0 V

4 COM1, COM2: IO= 100 µA 0.6 V

5 DO: IO= 1 mA 0.1 0.5 V

Output middle-level voltage

MID

1 COM1, COM2: VDD= 6.0 V, IO= ±100 µA 2.4 3.0 3.6 V

MID

2 COM1, COM2: VDD= 4.5 V, IO= ±100 µA 1.65 2.25 2.85 V

Current drain

1 Sleep mode, Ta = 25°C 5 µA

2 VDD= 6.0 V, output open, Ta = 25°C, f

OSC

= 50 kHz 1.4 2.5 mA

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1. When stopped with CL at the low level

2. When stopped with CL at the high level

Figure 1

Pin Assignment

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Block Diagram

Pin Functions

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Pin Pin No. Function Active I/O

Handling when unused

S1/P1 to S4/P4 S5 to S43

COM1 COM2

KS1/S44, KS2/S45, KS3 to KS6

KI1 to KI5

OSC

CE CL

DI DO

RES

1 to 4

5 to 43

44 45

46 47

48 to 51

52 to 56

62 63 64

Segment outputs: Used to output the display data that is transmitted over the serial data input. Pins S1/P1 to S4/P4 can be used as general-purpose outputs according to control data specification.

Common driver outputs. The frame frequency f

is (f

OSC

/512) Hz.

Key scan outputs. When a key matrix is formed, normally a diode will be attached to the key scan timing line to prevent shorts. However, since the output transistor impedance is an unbalanced CMOS output, it will not be damaged if shorted. Pins KS1/S44 and KS2/S45 can be used as segment outputs according to control data specification.

Key scan inputs: Pins with a built-in pull-down resistor.

Oscillator connection: Oscillator circuit can be formed by connecting the pin to a resistor and a capacitor.

CE: Chip enable CL: Synchronization clock DI: Transfer data DO: Output data

Serial data interface: Connected to the controller. Since DO is an open-drain output, it requires a pull-up resistor.

Reset input that re-initializes the LSI internal states. During a reset, the display segments are turned off forcibly regardless of the internal display data. All internal key data is reset to low and the key scan operation is disabled. However, serial data can be input during a reset.

Power supply connection. A supply voltage of between 4.5 and 6.0 V must be provided.

Power supply ground connection. Must be connected to GND.

—

I/O

I I O

—

Open

GND

Open

GND

—

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Serial Data Input

1. When stopped with CL at the low level

2. When stopped with CL at the high level

CCB address......................[42H]

D1 to D90...........................Display data

S0, S1 ................................Sleep control data

K0, K1 ................................Key scan output/segment output selection data

P0, P1 ................................Segment output port/general-purpose output port selection data

SC......................................Segment on/off control data

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Control Data Functions

1. S0, S1.................Sleep control data

This control data switches the LSI between normal mode and sleep mode. It also sets the key scan output standby states for pins KS1 to KS6.

Note: The KS1/S44 and KS2/S45 output pins are set to the key scan output state.

2. K0, K1................Key scan output/segment output selection data

This control data switches the KS1/S44 and KS2/S45 output pins between the key scan output and segment output functions.

X: don’t care

3. P0, P1.................Segment output port/general-purpose output port selection data

This control data switches the S1/P1 to S4/P4 output pins between the segment output port and the general-purpose output port functions.

The table below lists the correspondence between the display data and the output pins when the general-purpose output port function is selected.

For example, if the output pin S4/P4 is set for use as a general-purpose output port, the output pin S4/P4 will output a high level when the display data D7 is 1.

4. SC.......................Segment on/off control data

This control data controls the segment on/off states.

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Control data

Mode Oscillator

Segment outputs

Key scan standby mode output pin states

S0 S1

Common outputs

KS1 KS2 KS3 KS4 KS5 KS6 0 0 Normal Oscillator Operation H H H H H H 0 1 Sleep Stopped L L L L L L H 1 0 Sleep Stopped L L L L L H H 1 1 Sleep Stopped L H H H H H H

Control data Output pin states

Maximum number

K0 K1 KS1/S44 KS2/S45

of key inputs

0 0 KS1 KS2 30 0 1 S44 KS2 25 1 X S44 S45 20

Control data Output pin states

P0 P1 S1/P1 S2/P2 S3/P3 S4/P4

0 0 S1 S2 S3 S4 0 1 P1 P2 S3 S4 1 0 P1 P2 P3 S4 1 1 P1 P2 P3 P4

Output Corresponding

pin display data S1/P1 D1 S2/P2 D3 S3/P3 D5 S4/P4 D7

SC Display state

0 On 1 Off

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Display Data and Output Pin Correspondences

For example, the output states of output pin S11 are listed in the table below.

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Output pin COM1 COM2

S1/P1 D1 D2 S2/P2 D3 D4 S3/P3 D5 D6 S4/P4 D7 D8

S5 D9 D10 S6 D11 D12 S7 D13 D14 S8 D15 D16

S9 D17 D18 S10 D19 D20 S11 D21 D22 S12 D23 D24 S13 D25 D26 S14 D27 D28 S15 D29 D30 S16 D31 D32 S17 D33 D34 S18 D35 D36 S19 D37 D38 S20 D39 D40 S21 D41 D42 S22 D43 D44 S23 D45 D46 S24 D47 D48 S25 D49 D50 S26 D51 D52 S27 D53 D54 S28 D55 D56 S29 D57 D58 S30 D59 D60 S31 D61 D62 S32 D63 D64 S33 D65 D66 S34 D67 D68 S35 D69 D70 S36 D71 D72 S37 D73 D74 S38 D75 D76 S39 D77 D78 S40 D79 D80 S41 D81 D82 S42 D83 D84 S43 D85 D86

KS1/S44 D87 D88 KS2/S45 D89 D90

Display data Output pin state

D21 D22 S11

0 0 Segment off for both COM1 and COM2 0 1 Segment on for COM2 1 0 Segment on for COM1 1 1 Segments on for both COM1 and COM2

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Serial Data Output

1. When stopped with CL at the low level

2. When stopped with CL at the high level

CCB address......................[43H]

KD1 to KD30......................Key data

SA ......................................Sleep acknowledge data

Note: If key data is read when DO is high, the key data (KD1 to KD30) and sleep acknowledge data (SA) will be

invalid.

Output Data

1. KD1 to KD30.....Key data

When a key matrix with up to 30 keys is formed using the KS1 to KS6 output pins and the KI1 to KI5 input pins, the key data corresponding to a given key will be 1 if that key is pressed. The table below lists that correspondence.

When the output pins KS1/S44 and KS2/S45 are selected for segment output by the control data K0 and K1, the key data items KD1 to KD10 will be 0.

2. SA ......................Sleep acknowledge data

This output data is set according to the state when the key was pressed. If the LSI was in sleep mode, SA will be 1, and if the LSI was in normal mode, SA will be 0.

Sleep Mode

When S0 or S1 in the control data is set to 1, the oscillator at the OSC pin will stop (it will restart if a key is pressed) and the segment and common outputs will all go to the low level. This reduces the LSI power dissipation. However, the S1/P1 to S4/P4 output pins can be used as general-purpose output ports even in sleep mode if selected for such use by the P0 and P1 control data bits.

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Item KI1 KI2 KI3 KI4 KI5 KS1/S44 KD1 KD2 KD3 KD4 KD5 KS2/S45 KD6 KD7 KD8 KD9 KD10

KS3 KD11 KD12 KD13 KD14 KD15

KS4 KD16 KD17 KD18 KD19 KD20

KS5 KD21 KD22 KD23 KD24 KD25

KS6 KD26 KD27 KD28 KD29 KD30

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Key Scan Operation

1. Key Scan Timing The key scan period is 375T [s]. The key scan is performed twice to reliably determine the key on/off states, and the LSI detects key data agreement. When the key data agrees, the LSI determines that a key has been pressed, and outputs a key read request (by setting DO low) 800T [s] after the key scan started. If a key is pressed again without the key data agreeing, a key scan is performed once more. Thus key on/off operations shorter than 800T [s] cannot be detected.

*1 The high or low states of these signals in sleep mode are determined by the S0 and S1 control data bits.

2. Key Scan during Normal Mode

• The pins KS1 to KS6 are set high.

• A key scan starts if any key is pressed, and the scan continues until all keys have been released. Multiple key

presses can be recognized by determining if multiple key data bits have been set.

• When a key has been pressed for 800T [s] (where T = 1/f

OSC

) or longer, a key data read request (DO is set to low) is output to the controller. The controller acknowledges this request and reads the key data. However, DO will go high when CE is high during a serial data transfer.

• After the controller has finished reading the key data, the LSI clears the key data read request (by setting DO high)

and performs another key scan. Note that since DO is an open drain output, a pull-up resistor of between 1 and 10 kΩ is required.

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3. Key Scan during Sleep Mode

• The pins KS1 to KS6 are set high or low according to the S0 and S1 control data bits. (See the description of the control data function for details.)

• If a key for a line corresponding to one of the pins KS1 to KS6 which is high is pressed, the oscillator at the OSC pin starts and a key scan is performed. The key scan continues until all keys have been released. Multiple key presses can be recognized by determining if multiple key data bits have been set.

• When a key has been pressed for 800T [s] (where T = 1/f

OSC

• After the controller has finished reading the key data, the LSI clears the key data read request (by setting DO high)

and performs another key scan. Note that since DO is an open drain output, a pull-up resistor of between 1 and 10 kΩ is required.

• Key scan example in sleep mode

Example: Here S0 = 0 and S1 = 1 (This is a sleep in which only KS6 is high.)

Multiple Key Presses

Without the insertion of additional diodes, the LC75852 supports key scan for double key presses in general, triple key presses of keys on the lines for input pins KI1 to KI5, and multiple key presses of keys on the lines for the output pins KS1 to KS6. However, if multiple key presses in excess of these limits occur, the LC75852 may recognize keys that were not pressed as having been pressed. Therefore, series diodes must be connected to each key.

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1/2 Duty - 1/2 Bias LCD Drive Scheme

RES and the Display Controller

Since the LSI internal data (D1 to D90 and the control data) is undefined when power is first applied, the output pins S1/P1 to S4/P4, S5 to S43, COM1, COM2, KS1/S44 and KS2/S45 should be held low by setting the RES pin low at the same time as power is applied. Then, meaningless displays at power on can be prevented by transferring data from the controller and setting RES high when that transfer has completed.

Figure 2

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COM1

COM2

S1 to S45 outputs for segments on COM1 side being lit

S1 to S45 outputs for segments on COM2 side being lit

S1 to S45 outputs for segments on COM1,COM2 sides being lit

S1 to S45 outputs for segments on COM1,COM2 sides not being lit

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Internal Block States during the Reset Period (when RES is low)

1. CLOCK GENERATOR Reset is applied and the basic clock stops. However, the state of the OSC pin (the normal or sleep state) is determined after the control data S0 and S1 has been sent.

2. COMMON DRIVER, SEGMENT DRIVER & LATCH Reset is applied and the display is turned off. However, display data can be input to the LATCH.

3. KEY SCAN Reset is applied and at the same time as the internal states are set to their initial states, the key scan operation is disabled.

4. KEY BUFFER Reset is applied and all the key data is set to the low level.

5. CCB INTERFACE, CONTROL REGISTER, SHIFT REGISTER To allow serial data transfers, reset is not applied to these circuits.

X: don’t care Note: 3. These output pins are forcibly set to the segment output mode and held low.

4. Immediately following power on, these output pins are undefined until the control data S0 and S1 has been sent.

5. Since this output pin is an open-drain output, a pull-up resistor of between 1 and 10 kΩ is required. This pin is held high during the reset period even if key data is read.

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Output pin State during reset

S1/P1 to S4/P4 L

S5 to S43 L

COM1, COM2 L

KS1/S44, KS2/S45 L

KS3 to KS5 X

KS6 H

DO H

Output Pin States during the Reset Period (when RES is low)

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Sample Application Circuit

Note: * Since DO is an open-drain output, a pull-up resistor is required. Select a value (between 1 and 10 kΩ) that is appropriate for the capacitance of the

external wiring so that the waveforms are not distorted.

Notes on Controller Display Data Transfer

The LC75852 transfers the display data (D1 to D90) in two operations. To assure visual display quality, all the display data should be sent within a 30 ms or shorter period.

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Notes on Controller Key Data Read Techniques

1. Controller key data reading under timer control

• Flowchart

• Timing Chart

t3 ..................Key scan execution time (800T [s]) when the key scan data for two key scans agrees

t4 ..................Key scan execution time (1600T [s]) when the key scan data for two key scans does not agree and a key scan is executed again

t5 ..................Key address (43H) transfer time

t6 ..................Key data read time

T =

• Description When determining key on/off and reading key data, the controller must confirm the state of DO output when CE is low for each period t7. When DO is low, the controller recognizes that a key has been pressed and reads the key data. During this operation t7 must obey the following condition:

t7 > t5 + t6 + t4

If key data is read when DO is high, the key data (KD1 to KD30) and the sleep acknowledge data (SA) will be invalid.

OSC

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Page 15

2. Controller key data reading under interrupt control

• Flowchart

• Timing Chart

t3 ..................Key scan execution time (800T [s]) when the key scan data for two key scans agrees

t4 ..................Key scan execution time (1600T [s]) when the key scan data for two key scans does not agree and a key scan is executed again

t5 ..................Key address (43H) transfer time

t6 ..................Key data read time

T =

OSC

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No. 4828-16/16

LC75852E, 75852W

• Description When determining key on/off and reading key data, the controller must confirm the state of DO output when CE is low. When DO is low, the controller recognizes that a key has been pressed and reads the key data. After the time t8, the next key on/off determination and reading key data must be confirmed by the state of DO output when CE is low. During this operation t8 must obey the following condition:

t8 > t4

If key data is read when DO is high, the key data (KD1 to KD30) and the sleep acknowledge data (SA) will be invalid.

This catalog provides information as of November, 1997. Specifications and information herein are subject to change without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.

Datasheet LC75852W, LC75852E Datasheet (SANYO)

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