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MAX6946 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6946 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 24 page Configuration Register (0x10) Use the configuration register to select PWM phasing between outputs, test fade status, enable hardware startup from shutdown, and select shutdown or run mode (Table 2). Initial Power-Up All control registers reset upon power-up (Table 3). Power-up status sets I/O ports P0 to P9 to high imped- ance, and puts the device into shutdown. The MAX6946/MAX6947 powers up in shutdown. 10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control 8 _______________________________________________________________________________________ Table 2. Configuration Register (0x10) REGISTER BIT DESCRIPTION VALUE FUNCTION 0 Internal oscillator enabled as PWM clock source D7 OSC enable* 1 External oscillator input enabled as PWM clock source 0 RST does not change register data D6 RSTPOR options 1 RST resets registers to POR (power-on reset) state 0 PWM outputs are in phase D5 PWM stagger 1 PWM outputs stagger phase 0 Device not in hold-off D4 Hold-off status** 1 Device in hold-off 0 Device not in fade-off D3 Fade-off status** 1 Device in fade-off 0 Device not in ramp-up D2 Ramp-up status** 1 Device in ramp-up 0 Reset Run disabled D1 RST RUN enable 1 Reset Run enabled 0 Shutdown mode D0 RUN enable 1 Run mode *The OSCEN bit applies only to the MAX6946. OSCEN is always 0 for the MAX6947, and the MAX6947 ignores writes to the OSCEN bit. **Read-only bits. Table 3. Initial Power-Up Register Status REGISTER BIT DESCRIPTION POWER-UP CONDITION ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Port P0–P9 output level or PWM Port 0–9 high impedance 0x00–0x09 11111 1 1 1 Configuration Shutdown mode, Reset Run disabled 0x10 0/1* 0000 0 0 0 Ramp-down/hold-off Fade/hold-off disabled 0x11 00000 0 0 0 Ramp-up Disabled 0x12 00000 0 0 0 Output current ISET70 IPEAK = 10mA for ports P7–P0 0x13 00000 0 0 0 Output current ISET98 IPEAK = 10mA for ports P9, P8 0x14 00000 0 0 0 Global current Full current 0x15 00000 1 1 1 *Value is 0 for MAX6947 and 1 for MAX6946 bit. |
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