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ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 7. Interface Timing Specifications
PW CARRY
t PLH1 (CL = 15 pf)
t LDT
t LS-STH
t RESET_SCAN-STH
PW LS
Symbol
Min
-
1.0
1.0
2.0
1.0
5.0
Typ
-
-
-
-
-
-
Max
1.0
10.7
-
-
-
-
Unit
CLK
ns
CLK
CLK
CLK
CLK
CONFIGURATION
When the SETUPD pin is high, the configuration registers
are set to the default values in Table 8 . When the SETUPD
pin is low, the configuration registers can be programmed via
the differential interface.
When the SETUPD and SHUT_B pins are low and SETUP
is high, data can be written to the set-up register through the
differential interface. Once the register has been
programmed, the data is locked and the register cannot be
Table 8. Setup Interface Registers
reprogrammed again until a complete POR (Power-on-reset)
is applied. Although the setup register is only 32 bits, the
34848 requires the data to be written 3 times (i.e. 96 bits).
When SETUP is taken low, the 3 sets of data are compared.
If 2 or more sets match, then that data is used. Otherwise, the
default values are used. This interface programs the LED
current, boost frequency, PWM frequency, OVP voltage, and
LED short detection voltage.
D15
IL2
P1
D14
IL1
P0
D13
IL0
F2
D12
IS4
F1
D11
IS3
F0
D10
IS2
V2
D9
IS1
V1
D8
IS0
V0
D7
P9
S1
D6
P8
S0
D5
P7
C1
D4
P6
C0
D3
P5
R3
D2
P4
R2
D1
P3
R1
D0
P2
R0
?
?
?
?
?
?
?
?
IL[2:0] = Local dimming mode current control (‘000’ = 62.5 mA, ‘111’ = 80 mA). Default = ‘011’ = 70 mA
IS[4:0] = Scan mode current control (‘00000’ = 121.25 mA, ‘11111’ = 160 mA) Default = ‘01111’ = 140 mA
P[9:0] = PWM frequency (‘0000000000’ = 177 Hz, ‘1111111111’ = 1200 Hz). Default = ‘0111100011’ = 660 Hz
F[2:0] = Boost switching frequency (000 = 200 kHz, 001 = 300 kHz, 010 = 400 kHz, 011 = 500 kHz, 100 = 600 kHz,
101 = 700 kHz, 110 = 900 kHz, 111 = 1.2 MHz). Default = ‘101’ = 700 kHz
V[2:0] = Over-voltage protection threshold (‘000’ = 31 V, ‘111’ = 45 V). Default = ‘111’ = 45 V
S[1:0] = Scan mode row count (‘00’ = 2/8 row, ‘01’ = 3/8 row, ‘10’ = 4/8 row, ‘11’ = 5/8 row). Default = ‘01’ 3/8
C[1:0] = LED short detection voltage (‘00’ = disabled, ‘01’ = 3.0 V, ‘10’ = 4.0 V, ‘11’ = 5.0 V). Default = ‘10’ = 4.0 V
R[3:0] = reserved
TEST MODE
The TEST input can be used to place the 34848 into test
mode. In this mode, the device is placed in to a pre-
determined mode of operation as follows:
?
?
?
?
Control register loaded with default values
All PWM drivers set to 95% duty cycle
No input data and clock (no CLK, no LS)
Master device needs to use an on-chip oscillator to serve
as the reference frequency to PLL
34848
Analog Integrated Circuit Device Data
12
Freescale Semiconductor
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