Rainbow Electronics MAX11008 - Manual (Page 19)

Read Format
Use the following sequence to read 16 bits of data from
a MAX11008 register (see Figure 3):
1) Drive CS low to select the device.
2) Send the appropriate read command byte (see
Table 6 for the register address map). The com-
mand byte is clocked in on the rising edges of
SCLK.
3) Receive 16 bits of data. The first 4 bits of data are
always high. Data is clocked out on the falling edges
of SCLK.
4) Drive CS high.
I 2 C Serial Interface
Connect SPI/ I2C to DGND to select the I 2 C interface. The
I 2 C serial interface consists of a serial data line (SDA)
and a serial clock line (SCL). The MAX11008 is I 2 C com-
patible within the DV DD = 2.7V to 5.25V range. SDA and
SCL facilitate bidirectional communication between the
MAX11008 and the master at rates up to 400kHz for fast
mode and up to 3.4MHz for high-speed mode (HS
mode). See the
Bus Timing and HS I 2 C Mode sections
for more information on data-rate configurations.
Figure 4 shows the 2-wire interface timing diagram. The
MAX11008 is a transmit/receive slave-only device, rely-
ing upon a master to generate a clock signal. The mas-
ter (typically a microcontroller) initiates data transfers
on the bus and generates the SCL signal to permit data
transfer.
MAX11008
Dual RF LDMOS Bias Controller with
Nonvolatile Memory
______________________________________________________________________________________ 19
SCLK
C6 R/W C4 C5 C2 C3 C0 C1 DIN
CS
DOUT D14 D13 D12 D11 D10 D9 D8 D6 D5 D4 D3 D2 D1 D15 D7 D0
X X X X X X X X X X X X X X X X X X
Figure 3. SPI Read Sequence
SDA
SCL
t SU, DAT
t HD, STA
t HD, STA
t RCL
t LOW
t HIGH
t R t F
t HIGH
t RCL
t LOW
t SU, DAT t HD, DAT
t HD, DAT t HD, STA
t R t F
t BUF
t BUF
t RDA t RDA
t RCL
t HD, STA
t SU, STA t SU, ST0
t SU, ST0 t SU, STA
SCL
S Sr A
Sr A P S
P
F/S MODE HS MODE
S
S
SDA
a) F/S-MODE I 2 C SERIAL INTERFACE TIMING
b) HS-MODE I 2 C SERIAL INTERFACE TIMING
PARAMETERS ARE MEASURED FROM 30% TO 70%.
Figure 4. I 2 C Serial-Interface Timing Diagram