MAX11201BEUB+T【PDF 3/14 页】IC ADC 24BIT SRL 13.75SPS 10UMAX

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______________________________________________________________________________________ 11

MAX11201

24-Bit, Single-Channel, Ultra-Low-Power, Delta

Sigma ADC with 2-Wire Serial Interface

Figure 1. Timing Diagram for Data Read After Conversion

Figure 2. Timing Diagram for Data Read Followed by RDY/DOUT Being Asserted High Using 25th SCLK

Data Read Followed by Self-Calibration

To initiate self-calibration at the end of a data read, pro-

vide a 26th SCLK clock pulse. After reading the 24 bits

of conversion data, a 25th positive edge on SCLK pulls

the RDY/DOUT output back high, indicating the end of

the data read. Provide a 26th SCLK clock pulse to initi-

ate a self-calibration routine starting on the falling edge

of the SCLK. A subsequent falling edge of RDY/DOUT

indicates data availability at the end of calibration. The

timing is illustrated in Figure 3.

Data Read Followed by Sleep Mode

The MAX11201 can be put into sleep mode to save

power between conversions. To activate the sleep mode,

idle the SCLK high any time after the RDY/DOUT output

goes low (that is, after conversion data is available). It is

not required to read out all 24 bits before putting the part

in sleep mode. Sleep mode is activated after the SCLK is

held high (see Figure 4). The RDY/DOUT output is pulled

high once the device enters sleep mode. To come out

of the sleep mode, pull SCLK low. After the sleep mode

is deactivated (when the device wakes up), conversion

starts again and RDY/DOUT goes low, indicating the

next conversion data is available (see Figure 4).

Single-Conversion Mode

For operating the MAX11201 in single-conversion mode,

activate and deactivate sleep mode between conver-

sions as described in the Data Read Followed by Sleep

Mode section). Single-conversion mode reduces power

consumption by shutting down the device when idle

between conversions. See Figure 4.

D23

CONVERSION IS DONE

DATA IS AVAILABLE

CONVERSION IS DONE

DATA IS AVAILABLE

D22

SCLK

RDY/DOUT

D23

CONVERSION IS DONE

DATA IS AVAILABLE

CONVERSION IS DONE

DATA IS AVAILABLE

D22

SCLK

RDY/DOUT

25TH SLK RISING EDGE

PULLS RDY/DOUT

HIGH

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