ade3700 STMicroelectronics, ade3700 Datasheet - Page 80

• Manufacturer Part Number: ade3700
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions
• Manufacturer: STMicroelectronics

Pulse Width Modulation (PWM)
80/89
2.20
OMUX_CTRL_3
OMUX_REFCOUNT
PWM_CTRL0
Pulse Width Modulation (PWM)
The PWM block generates two signals that can be used to control backlight inverter switching
power components directly. It is derived from XCLK and can be powered up independently of the
DOTCLK and INCLK domains. The frequency, duty cycle, polarity and overlap/non-overlap are
programmable. The output frequency can be free-running or locked to the output vsync signal.
Register Name
Register Name
Table 32: Output Mux Registers (Sheet 4 of 4)
0x0C51
0x0C52
Table 33: PWM Registers (Sheet 1 of 2)
Addr
0x01A0
Addr
R/W
R/W
R/W
R
R/W
Mode
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Mode
[2]
[1]
[0]
[5:0]
[7:3]
[7:6]
Bits
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
Bits
0x0
0x0
0x0
0x0
0x0
0x0
0x0
0x0
Default
0x0
0x0
0x0
0x0
Default
PWM status
0: unlocked
1: locked
0: lock to CYCLES_PER_FRAME from the
free-running state machine
1: lock to CYCLES_PER_FRAME register
setting
PWM_A polarity
0: active low
1: active high
PWM_B polarity
0: active low
1: active high
0: normal operation
1: force PWM outputs to polarity settings
0: change period or duty cycle at the end of
the current cycle
1: smooth change, period or duty cycle
increment/decrement every
PWM_STEP_DELAY cycle
0: free-running
1: lock to out_vsync
0: disable PWM output
1: enable PWM output
PWM enable
TCON data invert enable, with computed
data invert pin.
Returns a value that indicates the ADE
gate speed -- a function of temp and
voltage
higher = faster logic
Reserved
PWM mux mode
Reserved
Description
Description
ADE3700