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LED Light Management IC in
2.5mm x 2.5mm UCSP
I 2 C Serial Interface
The step-up converter OUT voltage, FLED flash current
and duration, FLED movie current, and LED_ individual
currents are set using the I 2 C serial interface. Each cur-
rent level is individually programmable (including off)
with a single command (see Tables 1, 2, and 3). While
the flash current is set through I 2 C, current does not
flow until the FLEN input is logic 1, as described in the
Flash Current-Sink Regulator (FLED, MVON, FLEN)
section. By default, the movie current is turned on when
a nonzero setting is programmed through I 2 C.
Alternately, by setting a bit in the “other” register, the
movie mode current may also be gated by logic 1 at
the MVON input.
The I 2 C serial interface consists of a serial-data line
(SDA) and a serial-clock line (SCL). Standard I 2 C write-
byte commands are used. Figure 2 shows a timing dia-
gram for the I 2 C protocol. The MAX8830 is a slave-only
device, relying upon a master to generate a clock sig-
nal. The master (typically a microprocessor) initiates
data transfer on the bus and generates SCL to permit
data transfer. A master device communicates to the
MAX8830 by transmitting the proper 8-bit address
(0x94) followed by the 8-bit control byte. Each 8-bit
control byte consists of a command code (usually
3-bits) with the remaining bits (usually 5 bits) as data
(see Table 1). Each transmit sequence is framed by a
START (A) condition and a STOP (L) condition. Each
word transmitted over the bus is 8 bits long and is
always followed by an acknowledge clock pulse.
A
t LOW
B
t HIGH
C
D
E
F
G
H
I
J
K
L
M
SCL
SDA
t SU_STA
t HD_STA
t SU_DAT
t HD_DAT
t SU_STO
t BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
Figure 2. I 2 C Timing Diagram
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE (OP/SUS BIT)
H = LSB OF DATA CLOCKED INTO SLAVE
I = SLAVE PULLS SMBDATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
10
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