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CAT3604 датащи(PDF) 5 Page - Catalyst Semiconductor |
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CAT3604 датащи(HTML) 5 Page - Catalyst Semiconductor |
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5 / 11 page ![]() CAT3604 5 Doc. No. 5008, Rev. I © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice s e n i L l o r t n o Cs t u p t u O D E L 2 R T C1 R T C0 R T C4 D E L3 D E L2 D E L1 D E L 00 0 - - - N O 00 1 - - N O- 01 0 - N O- - 01 1 N O- - - 10 0 - - N ON O 10 1 - N ON ON O 11 0 N ON ON ON O 11 1 - - - - Table 2: LED Selection Notes: 1 = logic high (or VIN) 0 = logic low (or GND) - = LED output OFF SHORT CIRCUIT DETECT/DISABLE The unused LED channels can also be turned off by connecting the respective LED pins to VOUT. In which case, the corresponding LED driver is disabled and the typical LED sink current is only about 20 µA. When the following equation is true on any channel, the driver turns off the LED channel: VOUT - VLED ≤ 1V (LED channel OFF) Note: The CAT3604 is designed to drive LEDs with forward voltage greater than 1V and is not compatible with resistive loads. LED CURRENT SETTING The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 1 lists various LED currents and the associ- ated RSET resistor value for standard 1% precision surface mount resistors. ) A m ( t n e r r u C D E LR T E S k ( Ω Ω Ω Ω Ω) 19 4 6 27 8 2 52 0 1 0 19 . 9 4 5 14 . 2 3 0 27 . 3 2 0 34 . 5 1 Table 1. RSET Resistor Selection The digital control lines CTR0, CTR1 adn CTR2 allow to turn On or Off a combition of LEDs as shown in Table 2. |
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