PNI MS2100 - Manual (Page 7)

PNI Sensor Corporation 133 Aviation Blvd., Suite 101, Santa Rosa, CA 95403-1084 USA;, Fax: (707) 566-2261
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21-Jan-11 Page 7 of 16-
MS2100
Specifications & Instructions
Hardware Handshaking Line Descriptions
RESET
RESET is usually low. RESET must be toggled from low-high-low.
DRDY - Data Ready
DRDY is low after a RESET; after a command has been received and the data is ready, DRDY
will be high. It is recommended that the DRDY line always be used to ensure that the data is
clocked out of the MS2100 only when it is available. If it is determined that the DRDY line can-
not be used due to lack of I/O lines to the host processor, then the times listed in Table 6 can be
used to set open-loop wait times. The values listed are the maximum delays from the end of the
SCLK command until the rise of the DRDY at each period select setting. The maximum delay
occurs when the sensor being sampled is in a zero field.
Table 6: Typical Delay for DRDY
Period Select Typical Delay (msec)
a
/32 0.32
/64 0.53
/128 0.96
/256 1.8
/512 3.5
/1024 6.9
/2048 13.8
/4096 27.4
a. Calculated from (1/sensor frequency x (period
select) x 2 [Forward & reverse measurement]