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PDF HT1635B Data sheet ( Hoja de datos )
| Número de pieza | HT1635B | |
| Descripción | 44 x 8 LED Driver | |
| Fabricantes | Holtek | |
| Logotipo |  |
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HT1635A/HT1635B
44×8 LED Driver
Features
• Operating voltage: 2.4V~5.5V
• LED display -- 44 row and 8 Columns
• 88×4 bit RAM display data storage
• 16-level PWM brightness control
• Integrated 256kHz RC oscillator
• I2C-bus or 4-wire serial interface
• Data mode & command mode instructions
• Cascade function for extend applications
• Selectable NMOS open drain output driver and
PMOS open drain output driver for COM lines
• 64-pin LQFP package
Applications
• Industrial control displays
• Digital clocks, thermometers, counters, electronic
meters
• Instrumentation readouts
• Other consumer applications
• LED displays
General Description
The HT1635A/HT1635B is a memory mapping LED
display controller/driver. The maximum display
capacity of the device is 352 patterns composed of
44 rows and 8 commons. The device can generate 16
LED illumination levels using software controlled
PWM circuitry. A serial interface is provided to allow
the device to receive instructions for its command
mode and data mode. Only two or four lines are
required to interface the device to a host controller.
The display capacity can be easily extended by
cascading the devices thus expanding its application
possibilities. The device is compatible with most
microcontrollers offering easy interfacing via its two
serial interfaces, an I2C bus or a 4-wire serial bus.
Selection Table
Part Number
HT1635A
HT1635B
Interface
4-wire serial bus
I2C serial bus
Block Diagram
CSB/A0
RDB/A1
WRB/SCL
DATA/SDA
Control &
Timing Circuit
VDD
VSS
OSC
SYNC
IFS
Timing
Generator
Display RAM
2 VDD
ROW0
LED
Driver
ROW43
COM7
COM0
2 VSS
PWM Control
Rev. 1.20
1 August 26, 2015
1 page  
HT1635A/HT1635B
SDA
tf
tLOW
tr
tSU:DAT
tHD:STA
tBUF
tSP
SCL
SDA
OUT
tHD:STA
S
tHD:DAT
tAA
tHIGH
tSU:STA
Sr
I2C Bus Timing
tSU:STO
PS
4-wire Serial Bus
Symbol
Parameter
fsys
fLED
fclk1
fclk2
tcs
tclk
tr, tf
tsu
th
tsu1
th1
tod
tOFF
tSR
tRSTD
System Clock
LED Frame Rate
Serial Data Clock (WRB Pin)
Serial Data Clock (RDB Pin)
Serial Interface Reset Pulse Width
WRB, RDB Input Pulse Width
Rise/Fall Time for WRB, RDB Signal
(Figure 1)
Setup Time for DATA to WRB Clock Width
(Figure 2)
Hold Time for DATA to WRB Clock Width
(Figure 2)
Setup Time for CSB to WRB, RDB
Clock Width (Figure 3)
Hold Time for CSB to WRB, RDB
Clock Width (Figure 3)
Data Output Delay Time (Figure 4)
VDD Off Times (Figure 5)
VDD Rising Slew Rate (Figure 5)
Delay Time After Reset (Figure 5)
Test Conditions
VDD Conditions
5V On-chip RC oscillator
5V 1/8 duty
5V Duty cycle 50%
5V Duty cycle 50%
— CSB
Write mode
5V Read mode
——
——
——
——
——
——
— VDD drop down to 0V
——
——
Min.
230
—
—
—
250
0.5
1
—
50
100
200
100
—
10
0.1
1
VDD=2.4V~5.5V; Ta=25°C
Typ. Max. Unit
256
fSYS/2624
—
—
—
—
—
282
—
1
500
—
—
—
50 100
kHz
Hz
MHz
kHz
ns
μs
ns
100 — ns
200 — ns
300 — ns
200 — ns
100 200 ns
— — ms
— 0.8 V/ms
— — ms
Note: 1. If the conditions of the Power on Reset timing are not satisfied during power ON/OFF, the internal Power
on Reset (POR) circuit will not operate normally.
2. During normal operation, if the VDD drops below the minimum voltage as defined in the operating voltage
spec, then the conditions for the Power on Reset timing must also be satisfied. This means that VDD must
drop to 0V and remain there for 20ms (min.) before rising to the normal operating voltage.
3. Data transfers on the I2C-bus or 4-wire serial bus should be avoided for 1 ms following a power-on to allow
the reset sequence to complete
Rev. 1.20
5 August 26, 2015
5 Page 
HT1635A/HT1635B
Digital Dimming
The device contains versatile dimming functions. The complete display can be dimmed using pulse width
modulation techniques for the ROW driver with the Dimming command. The relationship between the ROW and
COM digital dimming duty times are shown in the accompanying diagram.
COM
ROW
(1/16) duty
ROW
(2/16) duty
ROW
(3/16) duty
ROW
(4/16) duty
ROW
(5/16) duty
ROW
(6/16) duty
ROW
(7/16) duty
ROW
(8/16) duty
ROW
(9/16) duty
ROW
(10/16) duty
ROW
(11/16) duty
ROW
(12/16) duty
ROW
(13/16) duty
ROW
(14/16) duty
ROW
(15/16) duty
ROW
(16/16) duty
1*T
2*T
3*T
4*T
5*T
6*T
7*T
8*T
9*T
10*T
11*T
12*T
13*T
14*T
15*T
16*T
Note: T=20×tSYS
tSYS=1/fSYS
4*tSYS
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
Rev. 1.20
11 August 26, 2015
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet HT1635B.PDF ] | |
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