AS1100PL datasheet(6/17 Pages) AMSCO

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AS1100

Data Sheet - D e t a i l e d D e s c r i p t i o n

8 Detailed Description

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

Table 4. The first 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.

Figure 5. Timing Diagram

Table 4. Serial data format (16bits)

Digit and Control Registers

The AS1100 incorporates 15 registers, which are listed in Table 5. The digit and control registers are selected via the

4Bit address word. The 8 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.

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 VDD,

so that nothing is displayed. All internal digit 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.

D15

D14

D13

D12

D11

D10

Address

MSB

Data

LSB

D15

D14

DOUT

DIN

CLK

LOAD

tCSW

tCL

tCH

tCP

tCS

tLDCK

tDO

tDS

tDH

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