OKI ML9298 Ml9298mb Datasheet

OKI Semiconductor
ML9298
FEDL9298-01
Issue Date: Jul. 11, 2005
12-Hour System Clock IC for 1/2 Duty Fluorescent Display Tubes
GENERAL DESCRIPTION
The ML9298 is a 12-hour system clock IC that drives 1/2 duty fluorescent display tubes. It has a wide range of
power supply using an oscillation source of 4.194304 MHz. The ML9298 has a time adjustment function in hour,
minute and 30-minute units, and the function has two adjustment modes, 1 Push 1 ADJ and 2Hz fast forward.
Additionally, it has a brightness adjustment function for the fluorescent display tube, providing four levels of
brightness settings.
FEATURES
•
•
•
•
•
•
12-hour system
Wide power supply range from 4 to 18V (built-in voltage regulator circuit)
Designed for 1/2 duty fluorescent display tubes
4.194304MHz (crystal oscillation)
Four levels of brightness settings
Package: 32-pin plastic SSOP (SSOP32-P-430-1.00-K) (ML9298MB)
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ML9298
BLOCK DIAGRAM
Logic circuits
VDDIN
F64HZ
Power-on reset
circuit
RESET
XT
Grid
decoder
DIM1
DIM2
Grid driver
Frequency divide circuit
XT
GR1
GR2
HS
ZA
BLANK
A/C
4b, 4c, 2b
2f
Minute counter
Segment
decoder
Hour counter
2c, col
Segment driver
MS
Time adjustment
2a, 2d
Second counter
2e
2g
3d, 1d
3e, 1e
3c, 1c
3g, 1g
RESET
3f, 1f
COLSEL
3b, 1b
3a, 1a
TEST
VDDOUT
3V regulator
VCC
High voltage circuit
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ML9298
PIN CONFIGURATION (TOP VIEW)
VCC
1
32 GR2
VDDOUT
2
31 GR1
VDDIN
3
30 2a, 2d
TEST
4
29 4b, 4c, 2b
DIM1
5
28 2f
DIM2
6
27 2c, col
BLANK
7
26 2e
HS
8
25 2g
MS
9
24 3d, 1d
ZA
10
23 3e, 1e
A/C
11
22 3c, 1c
XT
12
21 3g, 1g
XT
13
20 3f, 1f
(NC)
14
19 3b, 1b
F64HZ
15
18 3a, 1a
GND
16
17 COLSEL
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ML9298
PIN DESCRIPTION
DIM1
DIM2
I
I
Pull-up/
Pull-down
Pull-down
Pull-down
A/C
I
Pull-up
ZA
HS
MS
BLANK
I
I
I
I
Pull-up
Pull-up
Pull-up
Pull-down
COLSEL
I

XT
XT
TEST
F64Hz
GR1
GR2
1a, 3a to 2b, 4b, 4c
VCC
GND
I
O
I
O

Pull-up

IC testing pin. Leave this pin open or fix it to a “H” level.
64Hz signal output pin for oscillation frequency adjustment.
O

Output pins for the 1/2 duty fluorescent display tube grids.
O





VDDOUT
O

VDDIN
I



Output pins for the 1/2 duty fluorescent display tube anodes.
Power supply pin for high voltage.
Ground pin.
built-in regulator output pin for logic circuits. Connect the pin to
the VDDIN pin.
Power supply pin for logic circuits. Connect the pin to the
VDDOUT pin.
NC pin. Leave the pin open.
Pin
NC
I/O
Description
Brightness switching pin.
Input pin with a pull-up resistor to reset the circuits inside this LSI
at a “L” level.
Set the reset pulse width to 2 ms or more.
Zero adjust pin.
Hour digit adjustment pin.
Minute digit adjustment pin.
Blank input pin. Display disappears at a “L” level.
This is the input pin for selecting flashing or lighting of the colon
output.
"L" level : Flashing, "H" level : Lighting
Crystal oscillation pin to connect a crystal and capacitors Cx and
Cy externally.
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ML9298
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Condition
Rating
Unit
VCC
Ta = 25°C
–0.3 to 20
V
VDDIN
Ta = 25°C
–0.3 to 6.5
V
VHI
Ta = 25°C
–0.3 to VCC +0.3
V
VLI
Ta = 25°C
–0.3 to VDDIN+0.3
V
VHO
Ta = 25°C
–0.3 to VCC +0.3
V
VLO
Ta = 25°C
–0.3 to VDDIN+0.3
V
IHO
Ta = 25°C
–30 to 3
mA
Output current
(Logic)
ILO
Ta = 25°C
–5 to 5
mA
Power dissipation
PD
Ta ≤ 85°C
350
mW
TSTG
—
–55 to 150
°C
Power supply voltage
(High voltage)
Power supply voltage
(Logic)
Input voltage
(High voltage)
Input voltage
(Logic)
Output voltage
(High voltage)
Output voltage
(Logic)
Output current
(High voltage)
Storage temperature
RECOMMENDED OPERATING CONDITIONS
Parameter
Power supply voltage
(High voltage)
Power supply voltage
(Logic)
Operating temperature
Crystal frequency
Symbol
Condition
Min.
Typ.
Max.
Unit
VCC
—
4.0
12.0
18.0
V
VDDIN
—
2.8
3.2
3.6
V
Ta
—
–40
25
85
°C
f(X'tal)
—
4.194304
MHz
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FEDL9298-01
OKI Semiconductor
ML9298
ELECTRICAL CHARACTERISTICS
DC Characteristics
Parameter
Applicable pin
Symbol
(Vcc = 4.0 to 18.0 V, VDDIN = 2.8 to 3.6 V, Ta = −40 to 85°C)
Condition
Min.
Typ.
Max.
Unit
"H" input voltage
*1)
VIH
VCC = 4 to 18 V
VCC×0.8
—
—
V
"L" input voltage
*1)
VIL
—
—
VCC×0.2
V
DIM1, DIM2,
BLANK,
COLSEL
IIH1
20
65
200
µA
−2
—
2
µA
ZA, HS , MS , A/C,
TEST
IIH2
VCC = 4 to 18 V
VCC = 12 V
VIN = VCC
VCC = 12 V
VIN = 0 V
VCC = 12 V
VIN = VCC
VCC = 12 V
VIN = 0 V
VCC = 12 V
VIN = VCC
VCC = 12 V
VIN = 0 V
VCC = 12 V
IOH1 = −1 mA
VCC = 12 V
IOL1 = 0.55 mA
VCC = 12 V
IOH2 = −2 mA
VCC = 12 V
IOL2= 0.55 mA
VCC = 12 V
IOH3 = −15 mA
VCC = 12 V
IOL3 = 0.55 mA
VDDIN = 3.0V
IOH4 = −0.1mA
−2
—
2
µA
–200
–65
–20
µA
–2
—
2
µA
–2
—
2
µA
VCC–2.0
—
—
V
—
—
2
V
VCC–2.0
—
—
V
—
—
2
V
VCC–2.0
—
—
V
—
—
2
V
VDDIN–0.5
—
—
V
VDDIN = 3.0V
IOL4 = 0.1mA
—
—
0.5
V
*4)
—
400
600
µA
Input current
IIL1
IIL2
IIH3
COLSEL
IIL3
VOH1
*2)
VOL1
VOH2
*3)
VOL2
Output voltage
VOH3
GRID1, GRID2
VOL3
VOH4
F64HZ
VOL4
Dynamic supply
current
VCC
ICC
*
1) Applicable to the following pins:
DIM1, DIM2, BLANK, TEST, ZA, HS, MA, A/C, and COLSEL
*
2) Applicable to the following SEGMENT output pins:
1a and 3a, 1b and 3b, 1c and 3c, 1d and 3d, 1e and 3e, 1f and 3f, 1g and 3g, 2g, 2e, and 2f
*
3) Applicable to the following SEGMENT output pins:
2a, 2d, 2b and 4b, 4c and 2c, and col
*4) f = 4.194304 MHz, Cg = Cd = 33pF, VCC = 12V, open input, and non-loaded output
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FEDL9298-01
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ML9298
FUNCTIONAL DESCRIPTION
Time Base
Built-in 4.194304MHz crystal oscillation circuit (AMP, feedback resistor)
* Keep crystal and external capacitors as close to this LSI as possible to minimize connection wiring.
* The values of external components, such as crystal and capacitors, should be determined including capacitance
of user's circuit boards. It is recommended to contact a crystal manufacturer.
7-Segment Display Format
A
B
F
G
(7 segments)
C
E
D
Display Device
Dynamic drive 4-digit fluorescent display tube (with colon)
Relationship Between Anode/Grid Output and Display
3a
GR2
GR1
2a
1a
col
4b
4c
3f
3g
3e
3b
2f
2g
2e
3c
2b
1f
1b
1g
1c
2c 1e
col
digit4
3d
digit3
colon
2d
digit2
1d
digit1
Brightness Switching Function
4-level brightness settings (frequency = 256 Hz, gap between GR1 and GR2 at 1/2 duty = 32 µs)
Switch pin name
DIM1
DIM2
Operating mode
L
L
f = 256 Hz, 1/2 duty (50% display)
H
L
f = 256 Hz, 1/4 duty (25% display)
L
H
f = 256 Hz, 1/8 duty (12.5% display)
H
H
f = 256 Hz, 1/16 duty (6.25% display)
Display Mode
4-digit hour and minute display in 12-hour system
Hour display ·················· 1 to 12
Minute display ············ 00 to 59
No time display when the most significant digit is 0 (Most Significant Digit Zero Suppress function)
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FEDL9298-01
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ML9298
Time Adjustment
Hour/Minute Fast-forwarding Function
Hour and minute can be fast-forwarded separately. The HS (Hours Set) pin fast-forwards the hour digits, and the
MS (Minutes Set) pin fast-forwards the minute digits individually at 2Hz. One push counts one hour or one minute.
When continuously pushed, hour or minute is incremented at 2Hz.
The HS and MS pins are held at a “H” level by a pull-up resistor in the open state, being in the no active state.
These pins are placed in the active state by driving them at a “L” level externally.
The fast-forwarding of the hour and minute digits can be performed simultaneously.
When fast-forwarding the hour digits, the lower counter continues a regular operation, but the carry-over from the
minute to the hour is not performed.
When fast-forwarding the minute digits, carry over to the hour digits is not performed.
Zero Adjustment Function (±30 minute reset to zero)
The ZA (Zero Adjust) pin is held at a “H” level by a pull-up resistor in the open state, being in the no active state.
This pin is placed in the active state by driving it at a “L” level externally so that hours, minutes and seconds can be
adjusted to zeros.
If the minute digits is less than 30 minutes, the minute and second digits are reset to 00’00”.
Also, if the minute digits exceed 30 minutes, the minute and second digits are reset to 00’00”, and the hour digits
are carried over.
Moreover, the counter below seconds is reset up to 8 Hz.
<Examples of Zero Adjustments>
(X−1) hours 30 minutes 00 seconds
X hours 00 minutes 00 seconds
(X) hours 29 minutes 59 seconds
(X) hours 30 minutes 00 seconds
X hours 59 minutes 59 seconds
(X+1) hours 29 minutes 59 seconds
→ X hours 00 minutes 00 seconds
→ (X+1) hours 00 minutes 00 seconds
Blanking of Display
Blanking occurs in display by driving the BLANK pin at a “L” level externally.
Inputs from HS, MS, and ZA pins are disabled during blanking.
F64Hz Pin
This is the output pin for oscillation frequency adjustment, and constantly outputs a 64Hz signal.
External Reset
This device can be reset by placing the A/C pin at a “H” level.
After reset, the display starts at “1: 00”.
Built-in Regulator Circuit
The built-in regulator circuit reduces the power supply voltage (VCC) for the high voltage to the power supply
voltage for logic , which is output to the VDDOUT pin.
Power is supplied to logic circuitry by connecting the VDDOUT pin to the VDDIN pin.
Power-on Reset
The power-on reset circuit built in this device eliminates the need for providing an external reset circuit.
* Do the followings to operate the power-on reset circuit properly:
- Make a slope of a rise time of VCC to a voltage equal to or larger than 8V/ms.
- Connect a smoothing capacitor of 1000 pF±20% or more between the VDDOUT pin and GND.
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ML9298
TEST pin
This is the pin for testing this device.
This pin should be left open or fixed at a “H” level when not used.
Removal of Chatters
Three MS, HS and ZA input pins are connected to the chatter removing circuits internally, and therefore chatters
within 15.625 msec for each pin can be removed inside the device.
Colon Flashing/Lighting Select Function
Flashing or lighting of a colon can be selected by this COLSEL pin.
COLSEL
L
H
Operating mode
Flashing at 1 Hz
Lighting
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ML9298
PACKAGE DIMENSIONS
(Unit: mm)
SSOP32-P-430-1.00-K
Mirror finish
5
Package material
Lead frame material
Pin treatment
Package weight (g)
Rev. No./Last Revised
Epoxy resin
42 alloy
Solder plating (≥5µm)
0.60 TYP.
3/Dec. 5, 1996
Notes for Mounting the Surface Mount Type Package
The surface mount type packages are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name,
package name, pin number, package code and desired mounting conditions (reflow method, temperature and
times).
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ML9298
REVISION HISTORY
Document
No.
Date
Page
Previous Current
Edition
Edition
Description
PEDL9298-01
Dec. 1, 2004
–
–
Preliminary edition 1
FEDL9298-01
July. 11, 2005
–
–
Final edition 1
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FEDL9298-01
OKI Semiconductor
ML9298
NOTICE
1. The information contained herein can change without notice owing to product and/or technical improvements.
Before using the product, please make sure that the information being referred to is up-to-date.
2. The outline of action and examples for application circuits described herein have been chosen as an explanation
for the standard action and performance of the product. When planning to use the product, please ensure that the
external conditions are reflected in the actual circuit, assembly, and program designs.
3. When designing your product, please use our product below the specified maximum ratings and within the
specified operating ranges including, but not limited to, operating voltage, power dissipation, and operating
temperature.
4. Oki assumes no responsibility or liability whatsoever for any failure or unusual or unexpected operation
resulting from misuse, neglect, improper installation, repair, alteration or accident, improper handling, or
unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified
maximum ratings or operation outside the specified operating range.
5. Neither indemnity against nor license of a third party’s industrial and intellectual property right, etc. is granted
by us in connection with the use of the product and/or the information and drawings contained herein. No
responsibility is assumed by us for any infringement of a third party’s right which may result from the use
thereof.
6. The products listed in this document are intended for use in general electronics equipment for commercial
applications (e.g., office automation, communication equipment, measurement equipment, consumer
electronics, etc.). These products are not, unless specifically authorized by Oki, authorized for use in any
system or application that requires special or enhanced quality and reliability characteristics nor in any system
or application where the failure of such system or application may result in the loss or damage of property, or
death or injury to humans.
Such applications include, but are not limited to, traffic and automotive equipment, safety devices, aerospace
equipment, nuclear power control, medical equipment, and life-support systems.
7. Certain products in this document may need government approval before they can be exported to particular
countries. The purchaser assumes the responsibility of determining the legality of export of these products and
will take appropriate and necessary steps at their own expense for these.
8. No part of the contents contained herein may be reprinted or reproduced without our prior permission.
Copyright 2005 Oki Electric Industry Co., Ltd.
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