Datasheet

Smart Sensor

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CR4

CR2

CR1

CR3

R1F

R1V

R7R6

CLK

VR1

BLNK

INIT

BINH

GND

6-24 VDC

ECHO

OSC

Programmable Jumpe

(CLK)

Smart Senso

FIGURE 1: EXAMPLE OF A SINGLE-ECHO-MODE CYCLE WITHOUT BLANKING INPUT

Multiple Echo Mode

The Series 600 Smart Sensor has an external blanking input, BLNK, enabling selective echo exclusion for operation in a

multiple echo mode and can differentiate echoes from objects that are only three inches apart. If there is more than one

target and a single transmission detects multiple echoes, then the cycle is slightly different (Figure 2). After receiving the

first return signal which causes the ECHO output to go high, the Blanking (BLNK) input must be taken high then back low

to reset the ECHO output for the next return signal. The blanking signal must be at least 0.44 milliseconds in duration to

account for all 16 returning pulses from the first target and allow for internal delay times. This corresponds to the two

targets being 3 inches apart.

Gain Control and Gain Adjustment

During a cycle starting with INIT going high, the receiver amplifier gain is increased at discrete times (Figure 3) since the

transmitted signal is attenuated with distance. At approximately 38 milliseconds, the maximum gain is attained. To

calibrate the GAIN potentiometer, place the target at the maximum desired detection distance. Rotate the GAIN ADJUST

potentiometer VR1 fully counter-clockwise (CCW). Then slowly rotate the GAIN control clockwise (CW) until detection

occurs. Rotate the Gain control CW an additional 1/16 turn.

Note: Always calibrate the GAIN control for minimum gain required for reliable detection. Excessive gain may result in

false target detection.

Schematic and Component Layout