S1F76680 Epson Electronics America, Inc., S1F76680 Datasheet - Page 23

• Manufacturer Part Number: S1F76680
• Description: Led Driver
• Manufacturer: Epson Electronics America, Inc.

Description of the registers
7.5 Other functions
S1F76680 Technical Manual (Rev.1.22)
• Address
• Address
• Address
• Address
• Soft start function
• Charge pump function
Register name X3, X2, X1, X0
Register name NLED
Register name SEN2
Register name SRESET
Register name
Register name
Register name
S1F76680 is built in with the soft start function that prevents incoming current.
After power on of V
Even if it causes no problem to power on EN2 and EN3 after soft start, nonetheless, LED starts to light up
after soft start.
S1F76680 is equipped with a charge pump type DC/DC converter, which generates necessary voltage to
light up LED from voltage supplied to V
This charge pump circuit operates while selecting the booster magnification from 1.5 and 1 times
according to necessity, thus, provides a longer operating time to battery-operated devices.
To operate this circuit, pump-up capacitor C1 and C2, and storage capacitor CV
00H
01H
02H to 11H
1AH
* Automatic luminance control is enabled if either this register SEN2 or EN2 pin is set
* I
ILED6 to ILED0
Registers for imperative fixed current setting.
Y00 to YF6
Registers to set the current values for brightness 1 to 16 for auto luminance control.
TDW3 to TDW0, TUP3 to TUP0
They are the registers used for selecting LED current change time.
to “1.”
To exit reset, write as SRESET=0.
SRESET=0 can be written immediately after reset.
2
DD1
C will be reset when SRESET=1 or RESET pin=0.
and V
DD2
: 4-bit read-only brightness information. X3=MSB, X0=LSB.
: Register for imperative fixed current drive setting.
: Register for automatic luminance control operation setting.
: Register for I
voltage and that of EN1, soft start is carried out for 3msec.
Brightness information can only be read under the condition of EN2=1
or SEN2=1.
Also, it is possible to read brightness information regardless of
whether the imperative fixed current drive register is set to NLED=0
or NLED=1.
NLED=1
NLED=0
SEN2=1
SEN2=0
SRESET=1
SRESET=0
7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
DD1
pin, and supplies it to V
2
EPSON
C soft reset.
Enable driving at imperative fixed current value.
Default value.
Enable driving with automatic luminance control.
Default value.
Executes soft reset.
Default value.
OUT
pin.
OUT
are required.
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