Electronic Components Datasheet Search |
|
AS1100WL-T Datasheet(PDF) 5 Page - ams AG |
|
AS1100WL-T Datasheet(HTML) 5 Page - ams AG |
5 / 12 page Data Sheet AS1100 Revision 1.32, Oct. 2004 Page 5 of 12 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 table 4 some possible settings for register 09h are shown. Bit D7, which corresponds to the decimal point, is not affected by the settings of the decoder. Logic high means that the decimal point is displayed. In table 5 the font of the Code B decoder is shown. In table 6 the correspondence of the register to the appropriate segments of a 7 segment display is shown (see figure 2) Intensity Control and Interdigit Blanking Brightness of the display can be controlled in an analog way by changing the external resistor (RSET). The current, which flows between VDD and ISET, defines the current that flows through the LEDs. The LED current is 100 times the ISET current. The minimum value of RSET should be 9.53k Ω, 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 table 7. An internal pulse width modulator controls the intensity of the display. 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 RSET should be adjusted accordingly. Table 9 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). Address Register D15–D12 D11 D10 D9 D8 Hex Code No-Op X 0 0 0 0 0xX0 Digit 0 X 0 0 0 1 0xX1 Digit 1 X 0 0 1 0 0xX2 Digit 2 X 0 0 1 1 0xX3 Digit 3 X 0 1 0 0 0xX4 Digit 4 X 0 1 0 1 0xX5 Digit 5 X 0 1 1 0 0xX6 Digit 6 X 0 1 1 1 0xX7 Digit 7 X 1 0 0 0 0xX8 Decode Mode X 1 00 10xX9 Intensity X 1 0 1 0 0xXA Scan Limit X 1 0 1 1 0xXB Shutdown X 1 1 0 0 0xXC Not used X 1 1 0 1 0xXD Reset and ext. Clock X1 1 1 0 0xXE Display Test X1 1 1 1 0xXF Table 2: Register address map Register Data Mode Address Code (Hex) D7 D6 D5 D4 D3 D2 D1 D0 Shutdown Mode 0xXC XXX XXXX 0 Normal Operation 0xXC XXX XXXX 1 Table 3: Shutdown register format (address (hex) = 0xXC) |
Similar Part No. - AS1100WL-T |
|
Similar Description - AS1100WL-T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |