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CAT3636HV3-T2 Datasheet(PDF) 10 Page - ON Semiconductor |
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CAT3636HV3-T2 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 14 page CAT3636 http://onsemi.com 10 Register Configuration and Programming Table 6. REGISTER ADDRESS AND DATA Register Address Pulses Description Bits DATA Pattern Bit 3 Bit 2 Bit 1 Bit 0 REG1 1 Bank Enable and IMODE 4 IMODE ENA ENB ENC REG2 2 Global Current Setting 4 See Table 8 for values REG3 3 Bank A Current Setting 4 REG4 4 Bank B Current Setting 4 REG5 5 Bank C Current Setting 4 REG6 6 Return Lockout 1 RTLKO Register REG1 allows to set the mode and select the pairs of LEDs to be turned on. A low LED current mode exists to allow for very low current operation under 4 mA per channel. If IMODE equals 1, the high current range is selected up to 32 mA. If IMODE is set to 0, all currents are divided by 8. Each bank of LEDs (A, B or C) can be turned on independently by setting the respective bit ENA, ENB, ENC to 1, as shown in Table 7. For example, to enable all 6 LEDs in low current mode, REG1 is programmed to 0111 binary (9 data pulses). Table 7. REG1 REGISTER SETTING Data Pulses REG1 Value (binary) IMODE Bank Enable ENA ENB ENC 0 0000 0 − − − 1 1111 1 On On On 2 1110 1 On On − 3 1101 1 On − On 4 1100 1 On − − 5 1011 1 − On On 6 1010 1 − On − 7 1001 1 − − On 8 1000 1 − − − 9 0111 0 On On On 10 0110 0 On On − 11 0101 0 On − On 12 0100 0 On − − 13 0011 0 − On On 14 0010 0 − On − 15 0001 0 − − On 16 0000 0 − − − Register REG2 allows to set the same current for all 6 channels. REG3, REG4, REG5 allow to set the current respectively in banks A, B and C. The three banks can be programmed with independent current values. Table 8. REG2−5 CURRENT SETTING REGISTERS Data Pulses REGx Value (binary) LED Current IMODE = 0 LED Current IMODE = 1 0 0000 0.0 mA 2 mA 1 1111 3.75 mA 32 mA 2 1110 3.5 mA 30 mA 3 1101 3.25 mA 28 mA 4 1100 3 mA 26 mA 5 1011 2.75 mA 24 mA 6 1010 2.5 mA 22 mA 7 1001 2.25 mA 20 mA 8 1000 2 mA 18 mA 9 0111 1.75 mA 16 mA 10 0110 1.5 mA 14 mA 11 0101 1.25 mA 12 mA 12 0100 1 mA 10 mA 13 0011 0.75 mA 8 mA 14 0010 0.5 mA 6 mA 15 0001 0.25 mA 4 mA 16 0000 0.0 mA 2 mA REG6 contains the return lockout (RTLKO) bit. This stops the charge pump returning to 1x mode. One pulse sets it to 1. Two pulses or no pulses set RTLKO to 0. When RTLKO is set to 1, the charge pump cannot automatically return to 1x mode when in one of the charge pump modes. The device can however move from 1x to 1.33x to 1.5x to 2x if the input voltage is not sufficient to drive the programmed LED currents. REG6 also triggers a charge pump reset as soon as it is addressed. This forces the charge pump to start from 1x mode and reassess the correct mode it should be in to drive the LEDs most efficiently. If the input voltage has risen or the device has been reprogrammed to other LED values, it is recommended to trigger this reset allowing the charge pump to run in the most efficient mode. The CAT3636 enters a “zero current” shutdown mode if EN/SET is held low for 1.5 ms or more. All registers are reset back to zero when the device is placed in shutdown. |
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Descripción similar - CAT3636HV3-T2 |
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