 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MAX6954APL Datasheet(PDF) 7 Page - Maxim Integrated Products |
|
||||||||||||||||||||||||||||||
MAX6954APL Datasheet(HTML) 7 Page - Maxim Integrated Products |
|
|
7 / 39 page  4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan _______________________________________________________________________________________ 7 inputs: clock (CLK), chip select ( CS), and data in (DIN), and one output, data out (DOUT). CS must be low to clock data into or out of the device, and DIN must be stable when sampled on the rising edge of CLK. DOUT is stable on the rising edge of CLK. Note that while the SPI protocol expects DOUT to be high impedance when the MAX6954 is not being accessed, DOUT on the MAX6954 is never high impedance. CLK and DIN may be used to transmit data to other peripherals. The MAX6954 ignores all activity on CLK and DIN except when CS is low. Control and Operation Using the 4-Wire Interface Controlling the MAX6954 requires sending a 16-bit word. The first byte, D15 through D8, is the command, and the second byte, D7 through D0, is the data byte (Table 5). Connecting Multiple MAX6954s to the 4-Wire Bus Multiple MAX6954s may be daisy-chained by connect- ing the DOUT of one device to the DIN of the next, and driving CLK and CS lines in parallel (Figure 2). Data at DIN propagates through the internal shift registers and appears at DOUT 15.5 clock cycles later, clocked out on the falling edge of CLK. When sending commands to daisy-chained MAX6954s, all devices are accessed at the same time. An access requires (16 x n) clock cycles, where n is the number of MAX6954s connected together. To update just one device in a daisy-chain, the user can send the no-op command (0x00) to the others. Figure 3 is the MAX6954 timing diagram. The MAX6954 is written to using the following sequence: 1) Take CLK low. 2) Take CS low. This enables the internal 16-bit shift register. 3) Clock 16 bits of data into DIN, D15 first to D0 last, observing the setup and hold times. Bit D15 is low, indicating a write command. 4) Take CS high (while CLK is still high after clocking in the last data bit). 5) Take CLK low. Figure 4 shows a write operation when 16 bits are transmitted. If fewer or greater than 16 bits are clocked into the MAX6954 between taking CS low and taking CS high again, the MAX6954 stores the last 16 bits received, including the previous transmission(s). The general case is when n bits (where n > 16) are transmitted to the MAX6954. The last bits are comprising bits {n-15} to {n}, are retained, and are parallel loaded into the 16-bit latch as bits D15 to D0, respectively (Figure 5). DISPLAY TYPE 7 SEGMENT (16-CHARACTER HEXADECIMAL FONT) 14 SEGMENT/ 16 SEGMENT (104-CHARACTER ASCII FONT MAP) DISCRETE LEDs (DIRECT CONTROL) Monocolor 16 8 128 Bicolor 8 4 64 Table 1. MAX6954 Drive Capability 1dp 2dp fb ec d1 a1 i l g1 g2 hj mk a2 d2 dp dp 1a 1g 1f 1b 1e 1c 1d 2a 2g 2f 2b 2e 2c 2d fb ec d a i l g1 g2 hj mk Figure 1. Segment Labeling for 7-Segment Display, 14-Segment Display, and 16-Segment Display |
Similar Part No. - MAX6954APL |
|
Similar Description - MAX6954APL |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
