C/spi interface, Applications information – Rainbow Electronics MAX1386 User Manual

Page 45

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

______________________________________________________________________________________

Applications Information

ADC Clock Mode 11

See Figure 23 for an example of configuring a conver-
sion scan for internal temperature, PGAOUT1, and
ADCIN1 in clock mode 11 using the internal reference.
Timing symbols are referenced in the

Miscellaneous

Timing Characteristics

section.

See Figure 24 for an example of configuring a conver-
sion scan for ADCIN1, external temperature sensor 2,
and PGAOUT2 in clock mode 11 using the internal ref-
erence. Timing symbols are referenced in the

Miscellaneous Timing Characteristics

section.

Temperature-Threshold Examples

Table 26 shows some examples of temperature settings
in two’s-complement form.

Leap-Frogging the DACs for 18 Bits of

Resolution

Each DAC stage is configurable for leapfrog operation
by using the 8-bit coarse DACs in conjunction with the
10-bit fine DAC. Use the following procedure for setting
18 bits of resolution:

1) Write to the Coarse DAC1/DAC2 Write-Through Low

Wiper Input register (THRULO1/THRULO2)

2) Write to the Coarse DAC1/DAC2 Write-Through High

Wiper Input register (THRUHIGH1/THRUHIGH2) with
a value one higher or one lower than written to the
low wiper register.

MASTER TO SLAVE

SLAVE TO MASTER

FS MODE

MASTER CODE

SLAVE ADDRESS

COMMAND/DATA

SLAVE ADD

HS MODE CONTINUES

FS MODE

N BYTES PLUS ACK

HS MODE CAN ALSO BE CONTINUED
WITH A COMMAND BYTE

Figure 22. Changing to FS Mode or Staying in HS Mode

SCL

HS-MODE MASTER CODE

SDA

HS MODE

FS MODE

Figure 21. Changing to HS Mode