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LTC3205EUF Datasheet(PDF) 9 Page - Linear Technology |
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LTC3205EUF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LTC3205 9 3205f OPERATIO APPLICATIO S I FOR ATIO Interfacing to a Microcontroller The serial port of the LTC3205 can be connected directly to an MC68HC11 style microcontroller’s serial port. The microcontroller should be configured as the master device and its clock’s idle state should be set to high (MSTR = 1, CPOL = 1 and CPHA = 1 for the MC68HC11 family). Figure 5 shows the recommended configuration and directon of data flow. Note that an additional I/O line is Figure 5. Microcontroller Interface µCONTROLLER MOSI SCK GPIO 3205 F05 LTC3205 DIN SCLK LD Unused MAIN or SUB Display LED Pins Any of the six white LED pins (MAIN1-MAIN4, SUB1 and SUB2) can cause the LTC3205 to switch from 1:1 mode to 2:3 charge pump mode if they drop out. If an unused LED pin is left unconnected or grounded, it will automatically drop out and force the LTC3205 into charge pump mode. To avoid this problem, unused LED pins on the MAIN and SUB displays should be connected to CPO. However, power is not wasted in this configuration. When the LED pin voltage is within approximately 1V of CPO, its LED current is switched off and only a small 10 µA test current remains. Figure 4 shows a block diagram of each of the MAIN and SUB LED pins. The RED, GREEN and BLUE pins do not affect the state of the charge pump so they can be left floating or grounded if unused. total of 4096 colors. Table 3 indicates the decoding of the red, green and blue LEDs. The full-scale currents in the red, green and blue LEDs are controlled by the current at the IRGB pin in a similar manner to those in the main and sub panels. The IRGB pin is regulated at 1.223V and the LED current is a precise multiple of the IRGB current. The RGB display LED currents will follow the relationship: I V R RED GREENBLUE RGB ,, . = 400 1 223 where RRGB is the value of the resistor on the IRGB pin. Figure 4. Internal MAIN and SUB Panel LED Disable Circuit – + + – ~1V CPO MAIN1-MAIN4 SUB1, SUB2 10 µA 3205 F04 ENABLE ILED Table 3. RGB Duty Cycles D11 D10 D9 D8 D7 D6 D5 D4 HEX DUTY D3 D2 D1 D0 CODE CYCLE (%) 0 0 0 0 0 0/15 0 0 0 1 1 1/15 0 0 1 0 2 2/15 0 0 1 1 3 3/15 0 1 0 0 4 4/15 0 1 0 1 5 5/15 0 1 1 0 6 6/15 0 1 1 1 7 7/15 1 0 0 0 8 8/15 1 0 0 1 9 9/15 1 0 1 0 A 10/15 1 0 1 1 B 11/15 1 1 0 0 C 12/15 1 1 0 1 D 13/15 1 1 1 0 E 14/15 1 1 1 1 F 15/15 RGB Illuminator Drivers The red, green and blue LEDs can be individually set to have a duty cycle ranging from 0/15 (off) to 15/15 (full on) with 1/15 increments in between. The combination of 16 possible brightness levels gives the RGB indicator LED a |
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