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LC72121 Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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LC72121 Datasheet(HTML) 6 Page - Sanyo Semicon Device |
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6 / 22 page  No. 5815-6/22 LC72121, 72121M, 72121V Continued from preceding page. Pin Pin No. Type Function Equivalent circuit name LC72121 Chip enable • This pin must be set high to enable serial data input (DI) or serial data output (DO). CE 3 3 LC72121M LC72121V Input data • Input for serial data transferred from the controller DI 4 4 Clock • Clock used for data synchronization for serial data input (DI) and serial data output (DO). CL 5 5 Output data • Output for serial data transmitted to the controller. The content of the data transmitted is determined by DOC0 through DOC2. DO 6 6 Power supply • LC72121 power supply (VDD 2.7 to 3.6 V) • The power on reset circuit operates when power is first applied. —— VDD 17 18 Ground • Ground for the crystal oscillator circuit —— VSSX 2 2 Ground • Ground for the low-pass filter MOS transistor —— VSSa 21 22 Ground • Ground for the LC72121 digital systems other than those that use VSSa or VSSX. —— VSSd 14 15 I/O port • Shared function I/O ports • The pin function is determined by IOC1 and IOC2 in the serial data. When the data value 0: Input port When the data value 1: Output port • When specified to function as an input port: The input pin state is reported to the controller through the DO pin. When the input state is low: The data will be 0: When the input state is high: The data will be 1: • When specified to function as an output port: The output state is determined by IO1 and IO2 in the serial data. When the data value is 0: The output state will be the open circuit state. When the data value is 1: The output state will be a low level. • These pins are set to input mode after a power on reset. IO1 IO2 11 13 11 14 Output port • Output-only ports • The output state is determined by BO1 through BO4 in the serial data. When the data value is 0: The output state will be the open circuit state. When the data value is 1: The output state will be a low level. • A time base signal (8 Hz) is output from BO1 when TBC in the serial data is set to 1. BO1 BO2 BO3 BO4 7 8 9 10 7 8 9 10 Charge pump output • PLL charge pump output A high level is output when the frequency of the local oscillator signal divided by N is higher than the reference frequency, and a low level is output when that frequency is lower. This pin goes to the high- impedance state when the frequencies match. PD 18 19 Low-pass filter amplifier transistor • Connections for the MOS transistor used for the PLL active low-pass filter. AIN AOUT 19 20 20 21 IF counter • The input frequency range is 0.4 to 12 MHz • The signal is passed directly to the IF counter. • The result is output, MSB first, through the DO pin. • Four measurement periods are supported: 4, 8, 32, and 64 ms. IFIN 12 13 12 23 NC — NC pin • No connection —— |
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