18

µPC2533

The reference voltage of the

µPC2533-01 and µPC2533-02 detection comparator has been internally fixed at

1.0 V.

Under the influence of R501 (5 k

Ω) and R502 (5 kΩ) of the siganl meter circuit (Fig. 2-6), signal meter output voltage

and detection comparator input voltage do not perfectly coincide. For SD sensitivity setting, refer to the following

formula.

Detection comparator input voltage =

Signal meter output voltage

× (1 +

R501

)

Value of resistor between pin 7 and GND

Remark Because DC output is open-collector type (Active high), connect pull-up resistor to pin 10 to use.