MAX11212_12 Datasheet, PDF (12/14 Pages) Maxim Integrated Products – 18-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADC with 2-Wire Serial Interface

MAX11212
18-Bit, Single-Channel, Ultra-Low Power, Delta-
Sigma ADC with 2-Wire Serial Interface
Self-Calibration at Wake-Up
The MAX11212 can be put in self-calibration mode
immediately after wake-up from sleep mode. Self-
calibration at wake-up helps to compensate for tempera-
ture or supply changes if the device is shut down for
extensive periods. To automatically start self-calibration
at the end of sleep mode, all the data bits must be shift-
ed out followed by 25th SCLK edge to pull RDY/DOUT
high, and then on the 26th SCLK keep it high for as long
as shutdown is desired. Once SCLK is pulled back low,
the device automatically performs a self-calibration and,
when the data is ready, the RDY/DOUT output goes low.
See Figure 5. This also achieves the purpose of single
conversions with self-calibration.
SCLK
RDY/DOUT
CONVERSION IS DONE
DATA IS AVAILABLE
25TH SCLK PULLS RDY/DOUT HIGH
DEVICE ENTERS
SLEEP MODE
DEVICE EXITS OUT SLEEP MODE
AND STARTS CALIBRATION
1
2
3
t10
24
25
26
SLEEP
MODE
1
2
D17
D16
0
D17 D16
CONVERSION IS DONE
DATA IS AVAILABLE AFTER CALIBRATION
t12
Figure 5. Timing Diagram for Sleep Mode Activation Followed by Self-Calibration at Wake-Up
12  
Maxim Integrated