Datasheet

STOP Opcode
DRDY and DOUT
START Pin
or
STOP
(1)
STOP
(1)
t
SDSU
t
DSHD
START
(1)
Opcode
START Pin
DIN
t
SETTLE
DRDY
STOP
(1)
Opcode
or or
t
DR
ADS131E04
ADS131E06
ADS131E08
www.ti.com SBAS561A –JUNE 2012–REVISED APRIL 2013
Continuous Mode
Conversions begin when the START pin is taken high or when the START opcode command is sent. As seen in
Figure 34, the DRDY output goes high when conversions are started and then goes low when data are ready.
Conversions continue indefinitely until the START pin is taken low or the STOP opcode command is transmitted.
When the START pin is pulled low or the stop command is issued, the conversion in progress is allowed to
complete. Figure 35 and Table 8 show the required DRDY timing to the START pin and the START and STOP
opcode commands when controlling conversions in this mode. To keep the converter running continuously, the
START pin can be permanently tied high.
(1) START and STOP opcode commands take effect on the seventh SCLK falling edge.
Figure 34. Continuous Conversion Mode
(1) START and STOP commands take effect on the seventh SCLK falling edge at the end of the opcode transmission.
Figure 35. START to DRDY Timing
Table 8. Timing Characteristics for Figure 35
(1)
SYMBOL DESCRIPTION MIN UNIT
START pin low or STOP opcode to DRDY setup time
t
SDSU
16 1/2 f
MOD
to halt further conversions
START pin low or STOP opcode to complete current
t
DSHD
16 1/2 f
MOD
conversion
(1) START and STOP commands take effect on the seventh SCLK falling edge at the end of the opcode transmission.
Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 29
Product Folder Links: ADS131E04 ADS131E06 ADS131E08