AS1100PL austriamicrosystems, AS1100PL Datasheet - Page 7

• 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
8.5 Decode-Mode Register
In the AS1100 a BCD decoder is included. Every digit can be selected via register 09h to be decoded. The BCD code consists of the numbers 0-
9, E,H, L,P and -. In register 09h a logic high enables the decoder for the appropriate digit. In case that the decoder is bypassed (logic low) the
data Bits D7-D0 correspond to the segment lines of the AS1100. In
corresponds to the decimal point, is not affected by the settings of the decoder. Logic high means that the decimal point is displayed. In
the font of the Code B decoder is shown. In
shown
8.6 Intensity Control and Interdigit Blanking
Brightness of the display can be controlled in an analog way by changing the external resistor (R
and ISET, defines the current that flows through the LEDs. The LED current is 100 times the ISET current. The minimum value of R
be 9.53kΩ, which corresponds to 40mA segment current. The brightness of the display can also be controlled digitally via register 0Ah. The
brightness can be programmed in 16 steps and is shown in
8.7 Scan-Limit Register
The scan limit register 0Bh selects the number of digits displayed. When all 8 digits are displayed the update frequency is typically 800Hz. If the
number of digits displayed is reduced, the update frequency is reduced as well. The frequency can be calculated using 8fOSC/N, where N is the
number of digits. Since the number of displayed digits influences the brightness, the resistor R
shows the maximum allowed current, when fewer than 4 digits are used. To avoid differences in brightness the scan limit register should not be
used to blank portions of the display (leading zeros).
Table 5. Register Address Map
Table 6. Shutdown Register Format (address (hex) = 0xXC
www.austriamicrosystems.com/LED-Driver-ICs/AS1100
Normal Operation
Reset and ext. Clock
Shutdown Mode
(see Figure
Decode Mode
Display Test
Scan Limit
Mode
Shutdown
Register
Not used
Intensity
No-Op
Digit 0
Digit 1
Digit 2
Digit 3
Digit 4
Digit 5
Digit 6
Digit 7
6).
Address Code
D15-D12
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(Hex)
0xXC
0xXC
Table 9
the correspondence of the register to the appropriate segments of a 7 segment display is
D11
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D7
Table
X
X
10. An internal pulse width modulator controls the intensity of the display.
Revision 1.36
Table 7
Address
D10
D6
X
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
some possible settings for register 09h are shown. Bit D7, which
D5
X
X
D9
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Register Data
D4
X
X
SET
SET
should be adjusted accordingly. The
). The current, which flows between V
D3
X
X
D8
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D2
X
X
D1
X
X
Code
0xXA
0xXB
0xXC
0xXD
0xXE
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
0xX8
0xX9
0xXF
Hex
SET
Table 12
Table 8
should
D0
0
1
7 - 17
DD