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MAX6946 Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX6946
Description  10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6946 Datasheet(HTML) 8 Page - Maxim Integrated Products

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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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