AS1100PL austriamicrosystems, AS1100PL Datasheet - Page 6

• Manufacturer Part Number: AS1100PL
• Description: IC LED 8-DIGIT DRIVER 24-PDIP
• Manufacturer: austriamicrosystems

Specifications of AS1100PL

• Display Type: LED
• Configuration: 7 Segment + DP
• Interface: Serial
• Digits Or Characters: 8 Digits
• Current - Supply: 330mA
• Voltage - Supply: 4 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 24-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS1100
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
8.1 Serial-Addressing Modes
Programming of the AS1100 is done via 4 wire serial interface. A programming sequence consists of 16-bit packages. The data is shifted into the
internal 16 Bit register with the rising edge of the CLK signal. With the rising edge of the LOAD signal the data is latched into a digital or control
register depending on the address. The LOAD signal must go to high after the 16th rising clock edge. The LOAD signal can also come later but
just before the next rising edge of CLK, otherwise data would be lost. The content of the internal shift register is applied 16.5 clock cycles later to
the DOUT pin. The data is clocked out at the falling edge of CLK. The Bits of the 16Bit-programming package are described in
4 Bits D15-D12 are don’t care, D11-D8 contain the address and D7-D0 contain the data. The first bit is D15, the most significant bit (MSB). The
exact timing is given in
Figure 5. Timing Diagram
Table 4. Serial Data Format (16bits)
8.2 Digit and Control Registers
The AS1100 incorporates 15 registers, which are listed in
digit registers are realized with a 64bit memory. Each digit can be controlled directly without rewriting the whole contents. The control registers
consist of decode mode, display intensity, number of scanned digits, shutdown, display test, and reset/external clock register.
8.3 Shutdown Mode
The AS1100 features a shutdown mode, where it consumes only 20µA current. The shutdown mode is entered via a write to register 0Ch. Then
all segment current sources are pulled to ground and all digit drivers are connected to V
registers keep the programmed values. The shutdown mode can either be used for power saving or for generating a flashing display by
repeatedly entering and leaving the shutdown mode. The AS1100 needs typically 250µs to exit the shutdown mode. During shutdown the
AS1100 is fully programmable. Only the display test function overrides the shutdown mode.
8.4 Initial Power-Up
After powering up the system all register are reset, so that the display is blank. The AS1100 starts the shutdown mode. All registers should be
programmed for normal operation. The default settings enable only scan of one digit, the internal decoder is disabled, data register and intensity
register are set to the minimum value.
www.austriamicrosystems.com/LED-Driver-ICs/AS1100
D15
X
LOAD
DOUT
CLK
DIN
D14
X
D13
Figure
X
5.
D12
X
t
DS
D15
t
D11
DH
D10
Address
t
CL
D14
Table
D9
t
CH
5. The digit and control registers are selected via the 4Bit address word. The 8
Revision 1.36
D8
MSB
D7
D6
DD
D1
, so that nothing is displayed. All internal digit
D5
Data
t
CP
D4
t
DO
D0
D3
t
CS
D2
t
LDCK
t
LSB
CSW
Table
D1
5. The first
D0
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