E297S Atmel, E297S Datasheet - Page 3

• Manufacturer Part Number: E297S
• Description: BOARD PROGRAMMING AND TEST
• Manufacturer: Atmel
• Series: Quantumr

Specifications of E297S

• Rohs Status: RoHS non-compliant
• Other names: 427-1040

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Details
Board
OBJ Button
This button controls the 'Object Learn' point of the sensor. It sets the trip point at which an
object will be detected when the device is in the BG/OBJ or OBJ modes (see QT9701B2
datasheet for details). If this button is not pushed, the detection point is set to a level deter-
mined by Setups 0, Threshold.
RT/CT Transfer Timing Options
The RT and CT sockets (located mid-board) can be used to narrow the QT sampling time
for systems where conductive films (like water) are a problem. RT and CT allow enhanced
water suppression by restricting the amount of time stored charge in the water film has to
return to the sampling capacitor. The 'normal' transfer time (that with RT/CT unused)
mirrors the charge time, and can extend down to 200ns (See Setups Table in QTWinView
or the QT9701B2 datasheet). These 'normal' times are accessed by removing RT and
placing a jumper in the socket pins for CT (factory default). By inserting a 470 to 4.7K
resistor at RT and inserting a 20pF to 100pF capacitor for CT, a variety of transfer times
can be obtained. These transfer times must be adjusted with the aid of an oscilloscope on
test pin XFR (located near the 2-pin Signal connector). Transfer times well below 50ns are
possible with this circuit.
STAT LED
This LED acts as a multipurpose indicator that shows output state, error conditions, and
input feedback. STAT will output as follows depending on sensor state:
The device will repeatedly try to calibrate between each set of flashing signals. If [E.a] is
off, the recalibration attempts will be much quicker, since the STAT codes are not output
to the LED.
OUT LED
This LED reflects the state of the OUT line. If 'On', the OUT line is high. Note that the
OUT line can be inverted in polarity using Setup 'J'. If set to 'Active Low', the LED will be
off if a detection is sensed. The OUT signal can be stretched by configuring Setup 'L'.
Running and not detecting: LED flickers at a 10% duty cycle.
Running and detecting: LED flickers at a 90% duty cycle (bright flicker).
When either BG or OBJ are pushed: LED is forced off for the duration of the push.
If BG or OBJ are pushed for >2secs: (Change of cal mode requested) After button
release, the LED will go 'solid on' (no flicker) for ¾ second before it enters the new
calibration mode.
While calibrating: LED will be off; this usually takes under a second.
If a Sense line short-circuit is detected while running: LED will go 'solid on' for the
duration of the short.
On a calibration error: LED will output a repeating error code, provided that Output
Error Code function [E.a] is set ‘on’:
Double repeating pulse: Excess capacitive load
Single repeating pulse: CHG shorted to ground
Triple repeating pulse: Unstable signal, cannot calibrate
E E 297S