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LC72148V Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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LC72148V Datasheet(HTML) 6 Page - Sanyo Semicon Device |
6 / 21 page No. 6974-6/21 LC72148V Continued from preceding page. Pin No. Symbol Type Function Pin circuit • Input/output shared-function pins • In output mode, the circuits are complementary outputs. • The I/O direction is determined by I/O-4 and I/O-5 in the serial data. When the data is 0: input port When 1: output port • When specified for use as input ports The input pin states are transmitted from the DO pin to the controller Input state = low : Data = 0 Input state = high : Data = 1 • When specified for use as output ports The output states are determined by OUT4 and OUT5 in the serial data. Data = 0 : low Data = 1 : high • These pins are set to function as input ports by the power-on reset. I/O-4 I/O-5 9 8 General-purpose I/O ports • The OUT6 bit in the serial data is latched and output from O-6. O-6 7 Output port • The OUT7 bit in the serial data is latched and output from O-7. • This pin outputs the 8 Hz clock time base signal when TBC is 1. • This pin is set to the open state by the power-on reset. O-7 6 Output port • PLL charge pump output pins When the frequency created by dividing the local oscillator signal frequency by N is higher than the reference frequency, a high level is output from the PD0 pin, and when lower, a low level is output. When the frequencies match, PD0 goes to the high-impedance state. • PD1 operates in a similar manner. PD0 PD1 20 19 Charge pump output • HCTR is selected when CTS1 in the serial data input is set to 1. — The input frequency range is 0.4 to 25 MHz —The signal is passed through an internal divide-by-two circuit and transmitted to a general-purpose counter. An integrating count can also be performed. —The result is output starting with the MSB of the general-purpose counter from the DO pin. — There are four counting time periods: 4, 8, 32, or 64 ms. — See the item on the general-purpose counter for details. • When H/I-6 in the serial data is set to 0 — This pin functions as an input port, and its state is output from the DO output pin. HCTR/I-6 14 General-purpose counter • LCTR is selected when CTS1 in the serial data input is set to 0. • When CTS0 in the serial data input is set to 1 in the CTS1=0 state. — The circuit operates in frequency measurement mode. — The input frequency range is 10 to 500 kHz. — The signal is transmitted directly to the general-purpose counter. • When CTS0 in the serial data input is set to 0 — The circuit operates in period measurement mode. — The input frequency range is 1 Hz to 20 kHz. —The measurement period can be set to be either 1 period or 2 periods. If 2-period measurement is selected, the input frequency range will be 2 Hz to 40 kHz. —The result is output starting with the MSB of the general-purpose counter from the DO pin. — See the item on the general-purpose counter for details. • When L/I-7 in the serial data input is set to 0. —This pin functions as an input port, and its state is output from the DO output pin. LCTR/I-7 13 S General-purpose counter |
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