LC72191M View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
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LC72191M Datasheet PDF : 16 Pages
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LC72191, 72191M, 72191JM
Continued from preceding page.
Pin No. Symbol
7
IN0
8
IN1
I/O
Type
Input* Input port
Function
• The values of the IN0 and IN1 input ports can be converted from parallel to serial and
output from the DO output pin.
16
HCTR
Input
General-purpose
counter
Frequency
measurement signal
input pin
• HCTR is selected when SC in the serial input data is set to 1.
• Input frequency range: 10 to 60 MHz (70 mVrms minimum)
• The signal is supplied to a general-purpose 20-bit binary counter after passing through a
divide-by-eight circuit. Therefore, the value of the counter is 1/8 of the frequency actually
input to HCTR.
• When HCTR is selected the LC72191 will function in frequency measurement mode
and the measurement period can be selected to be either 12 or 24 ms. (GT = 0: 12 ms,
1: 24 ms)
• The result of the measurement (the value of the general-purpose counter) can be output
MSB first from the DO output pin.
15
LCTR
Input
General-purpose
counter
Frequency or period
measurement signal
input pin
• LCTR is selected when SC in the serial input data is set to 0.
• When SF in the serial input data is set to 1:
— Frequency measurement mode is selected.
— Input frequency range: 15 to 500 kHz (70 mVrms minimum).
— The signal is supplied directly to the general-purpose counter without passing
through the internal divide-by-eight circuit.
— The measurement period is the same as for HCTR.
• When SF in the serial input data is set to 0:
— Period measurement mode is selected.
— Input frequency range: 1 Hz to 20 kHz (VIH = 0.7 VDD minimum, VIL = 0.3·VDD
maximum)
— The measurement can be selected to be for one or two cycles. If two cycle
measurement is selected the input frequency range becomes 2 Hz to 20 kHz.
(GT = 0: one cycle, 1: two cycles)
• Measurement results are output in the same manner as HCTR measurement results.
Note: * The high and low level input voltages for the CE, CL, DI, IN0 and IN1 pins are VIH = 2.2 to 6.5 V and VIL = 0 to 0.7 V, regardless of the power
supply voltage VDD.
Control Data Format (serial input data)
The LC72191 control data consists of 36 bits. All 36 bits must be input after power is applied to set up the LC72191
initial state. This is because the last two bits, while being unrelated to user functions, are data that switches the LSI test
modes.
Once the LC72191 has been initialized, the contents of the first 24 bits (D0 to CTEN) can be changed without changing
the contents of the last 12 bits (R0 to T1) by inputting data to DI in serial data input mode.
No. 3985-7/16
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