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LED7708 Datasheet(PDF) 8 Page - STMicroelectronics

Part # LED7708
Description  16 channels x 85 mA LED driver with boost controller and 4-wire serial interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7708 Datasheet(HTML) 8 Page - STMicroelectronics

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Pin function
LED7708
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Doc ID 022698 Rev 1
11
XOVF
Internal DAC overflow I/O. Used for extended output voltage regulation and fault
management in multi-device applications. It is used to inform slave devices that the
maximum output voltage has been reached. A 100 k pull-up resistor to LD03 is required.
12
XMSK
Fault detection masking I/O. This signal is used for extended output voltage regulation &
fault management in multi-device applications. It is used to avoid incorrect fault detection
by forcing slave devices to ignore LED-short detection during output voltage steering. A
100 k pull-up resistor to LD03 is required.
13
FSW
Switching frequency selection / synchronization input. Used to set the desired switching
frequency of the boost controller. Also used as synchronization input.
14
SYNC
Boost converter synchronization output. The buffered switching clock signal is provided at
this pin to eventually synchronize other SMPS in the host system.
15
FOSC
Dimming oscillator frequency. A resistor to ground sets the frequency of the internal
grayscale clock dimming oscillator. If set high, the internal dimming oscillator is disabled
and the GSCK pin becomes the clock input (see GSCK pin).
16
CLIM
Boost section current limit setting. A resistor between this pin and SGND sets the boost
converter current limit.
17
SLOPE
Slope compensation setting. A resistor between this pin and SGND is required to set the
proper amount of slope compensation to avoid sub-harmonic instability.
18
COMP
Transconductance amplifier output. Connect a simple RC series between this pin and
SGND to properly compensate the loop-gain of the boost converter.
19
ISETH
Output current setting (on). Connect a resistor between this pin and SGND to set the
current sunk by each channel during the on-phase of the dimming.
20
ISETL
Output current setting (off). Connect a resistor between this pin and SGND to set the
current sunk by each channel during the off-phase of the dimming (LED biasing). Connect
to LDO3 to disable the bias current.
21
SGND
Signal ground. Common return for signals and settings.
22
AGND
Analog Ground. Common return for the current generators (channels).
23
CH1
Driver output (channel) #1.
24
CH2
Driver output (channel) #2.
25
CH3
Driver output (channel) #3.
26
CH4
Driver output (channel) #4.
27
CH5
Driver output (channel) #5.
28
CH6
Driver output (channel) #6.
29
CH7
Driver output (channel) #7.
30
CH8
Driver output (channel) #8.
31
CH9
Driver output (channel) #9.
32
CH10
Driver output (channel) #10.
33
CH11
Driver output (channel) #11.
34
CH12
Driver output (channel) #12.
35
CH13
Driver output (channel) #13.
Table 2.
Pin description (continued)
Pin
Function


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