upd178016 Renesas Electronics Corporation., upd178016 Datasheet - Page 40

• Manufacturer Part Number: upd178016
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

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(c) Determining the decode state
The boundary voltages between the adjacent ranges are those voltages input to the SMT_A/B pin and
SMT_B/C pin when the power is first applied.
These voltages must be input so that SMT_A/B voltage > SMT_B/C voltage.
If SMT_A/B voltage SMT_B/C voltage, the SMT_B/C voltage is invalid, so that the SMT_A/B voltage is used
as the boundary voltage.
In this case, two ranges, A and C, are used, as shown below.
<1> Calculate the average of ten blocks, decoded in one second, and use this average as the decode state
<2> The number of blocks remains pending until ten items of data have been read after the frequency has
<3> If the RDS pin is high when the number of blocks is read, the number of blocks at that time will be 0.
Figure 3-1. Signal Meter Reading Ranges (where SMT_A/B voltage > SMT_B/C voltage)
Figure 3-2. Signal Meter Reading Ranges (where SMT_A/B voltage
(number/number pending).
been changed.
Input voltage of SMT_A/B pin
(pin 1)
Input voltage of SMT_B/C pin
(pin 2)
Input voltage of SMT_A/B pin
(pin 1)
Supply voltage V
Signal meter reading (V)
Signal meter reading (V)
DD
= 5 V
(pin 3)
(pin 3)
Range A
Range B
Range C
Range A
Range C
SMT_B/C voltage)
PD178016GC-051