MAX1385 Datasheet, PDF(25/52 Page) Maxim Integrated Products – Dual RF LDMOS Bias Controllers with I2C/SPI Interface

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

MAX1385 Datasheet, PDF (25/52 Pages) Maxim Integrated Products – Dual RF LDMOS Bias Controllers with I2C/SPI Interface

◁

Dual RF LDMOS Bias Controllers

with I2C/SPI Interface

MEASUREMENT VALUE

(TEMPERATURE OR CURRENT)

HIGH THRESHOLD

BUILT-IN HYSTERESIS

LOW THRESHOLD

TIME

ALARM OUTPUT

OUTPUT-

COMPARATOR MODE

(ACTIVE LOW)

OUTPUT-

INTERRUPT MODE

(ACTIVE LOW)

FLAG REGISTER

FLAG REGISTER FLAG REGISTER

TIME

READ

Figure 8. Window-Threshold-Mode Timing Diagram

In single-conversion mode (CKSEL = 11), the BUSY

signal remains high until the ADC has completed the

current conversion (not the entire scan, just the current

conversion), the data has been moved into the FIFO,

and the alarm limits for the channel have been checked

(if enabled). In multiple-conversion mode (CKSEL = 01

or CKSEL = 00), the BUSY signal remains high until all

channels have been scanned and the data from the

final channel has been moved into the FIFO and

checked for alarm limits (if enabled). In continuous-con-

version mode (CONCONV = 1), the BUSY signal does

not go high as a result of ADC conversions; however,

BUSY does go high when CONCONV is removed and

remains high until the current scan is complete and the

ADC sequence halts.

After commanding any of the DAC autocalibration compo-

nents, wait for BUSY to go low before setting OSCPD to 1.

Alarm Modes

The MAX1385/MAX1386 contain several programmable

modes for configuring outputs ALARM, SAFE1, and

SAFE2 behavior. Window-threshold mode allows SAFE_

to assert when the temperature/current is too high or

too low (outside the window). Hysteresis-threshold

mode allows SAFE_ to assert when the temperature/

current is too high, and then to deassert when the tem-

perature/current falls back to an appropriate level.

ALARM asserts when SAFE1 and/or SAFE2 asserts.

Program ALARM for output-comparator mode to stay

asserted after an alarm condition until temperature/cur-

rent levels are back below programmed thresholds.

Program ALARM for output-interrupt mode to stay

asserted after an alarm condition until the Flag register

is read.

Window-Threshold Mode

In window-threshold mode, ADC readings of

current/temperature are compared to the configured

current/temperature low/high thresholds that are pro-

grammed to cause an alarm condition. If an ADC read-

ing falls out of the configured window and ALARM is

configured for output-comparator mode, ALARM

asserts until the current/temperature reading falls back

into the window (past the built-in hysteresis). If an ADC

reading falls out of the configured window and ALARM

is configured for output-interrupt mode, ALARM asserts

until the Flag register is read. Set the amount of built-in

hysteresis from 8 LSBs to 64 LSBs (see the ALMSCFG

(Read/Write) section). See Figures 7 and 8.

______________________________________________________________________________________ 25

▷