LED Driver. HT1635A Datasheet

HT1635A Driver. Datasheet pdf. Equivalent

HT1635A Datasheet
Recommendation HT1635A Datasheet
Part HT1635A
Description 44 x 8 LED Driver
Feature HT1635A; HT1635A/HT1635B 44×8 LED Driver Features • Operating voltage: 2.4V~5.5V • LED display -- 44 row a.
Manufacture Holtek
Datasheet
Download HT1635A Datasheet




Holtek HT1635A
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



Holtek HT1635A
Pin Assignment
HT1635A/HT1635B
ROW12
ROW11
ROW10
ROW9
ROW8
VDD
ROW7
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
ROW0
VSS
OSC
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8
HT1635A
41
9
64 LQFP-A
40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
ROW29
ROW30
ROW31
ROW32
ROW33
ROW34
ROW35
VDD
ROW36
ROW37
ROW38
ROW39
ROW40
ROW41
ROW42
ROW43
ROW12
ROW11
ROW10
ROW9
ROW8
VDD
ROW7
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
ROW0
VSS
OSC
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8
HT1635B
41
9
64 LQFP-A
40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
ROW29
ROW30
ROW31
ROW32
ROW33
ROW34
ROW35
VDD
ROW36
ROW37
ROW38
ROW39
ROW40
ROW41
ROW42
ROW43
Rev. 1.20
2 August 26, 2015



Holtek HT1635A
HT1635A/HT1635B
Pin Description
Pin Name
I/O
Function
COM0~COM7 O LED common output lines.
ROW0~ROW43 O LED row output lines.
VDD
Positive power supply.
In PCB Layout that must connect all of the VDD pins to the power plane.
VSS
Negative power supply.
In PCB Layout that must connect all of the VSS pins to the GND plane.
DATA/SDA
Serial data input/output pin. Data is input to / comes out from the shift register at rising
edge of the clock.
I/O • I2C interface serial data (SDA) Input/Output. NMOS open-drain output
• 4-wire serial interface serial data input/output. Input has pull-high resistor and output is
CMOS type.
WRB/SCL
Serial clock input pin.
I
• I2C interface serial clock SCL input.
• 4-wire serial interface WRITE Clock (CLK) input. Connected to pull-high resistor. Data
on the DATA line is latched into the device on the rising edge of the WRB signal.
RDB/A1
• I2C interface device address data input pin.
• 4-wire serial interface READ clock input. Connected to pull-high resistor. The device
I RAM data is clocked out on the falling edge of RDB. The clocked out data will appear
on the DATA line. The host controller can use the next rising edge to latch the clocked
out data.
CSB/A0
• I2C interface device address data input pin.
• Chip select input. Connected to pull-high resistor. When CSB is high, a data and
I command instruction read from or written to the device is disabled and the serial
interface circuit is also reset. If CSB is low data and command instruction transmission
between the host controller and the device is enabled.
OSC
• If the RC MASTER MODE command is programmed, the system clock is sourced from
I/O
the internal RC oscillator and the system clock is output on the OSC pin.
• If the SLAVE MODE or EXT CLK MASTER MODE command is programmed, the
system clock is sourced from an external clock on the OSC pin.
SYNC
• If the RC MASTER MODE or EXT CLK MASTER MODE command is programmed, the
I/O
synchronous signal is output on the SYNC pin.
• If the SLAVE MODE command is programmed, the synchronous signal is input on the
SYNC pin.
Absolute Maximum Ratings
Supply Voltage ��������������������������������������������������������������������������������������������������������������������������� VSS-0.3V to VSS+6.0V
Max junction Temperature (Tj).......................... 125˚C
Thermal Resistance (Rth).................................40˚C/W
Storage Temperature............................. -50˚C to 125˚C
Operating Temperature........................... -40˚C to 85˚C
Power Dissipation (PD)(@Ta=25˚C)...................2.5W
(@Ta=85˚C)....................1.0W
Input Voltage............................. VSS-0.3V to VDD+0.3V
Note: 1. These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings”
may cause substantial damage to the device. Functional operation of this device at other conditions
beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may
affect device reliability.
2. For the actual usage, please refer to the PD-Ta characteristics diagram in the package specification, follow
the power supply voltage, load and ambient temperature conditions to ensure that there is enough margin
and the thermal design does not exceed the allowable value.
Rev. 1.20
3 August 26, 2015







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