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ST75C540FP-A 数据表(PDF) 6 Page - STMicroelectronics |
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ST75C540FP-A 数据表(HTML) 6 Page - STMicroelectronics |
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6 / 84 page  II.2 - Host Interface The exchanges with the control processor proceed through a 128 x 8 DUAL port RAM shared between the ST75C530/540 and the Host. The signals associated with this interface are : Pin Name Type Description SD0..SD7 I/O System Data Bus. 8-bit data bus used for asynchronous exchanges between t he ST75C530/540 and the Host through the dual port RAM. High impedance when exchanges are not active. SA0..SA6 I System Address Bus. 7-bit address bus for dual port RAM, IO and interrupt registers. SDS (SRD) I System Data Strobe. In Motorola mode SDS initiates the exchange, active low. In Intel mode SRD initiates a read exchange, active low. SR/W (SWR) I System Read/Write. In Motorola mode SR/W defines the type of exchange read/write. In Intel mode SWR initiates a write exchange, active low. SCS I System Chip Select. Active low. SINTR OD System Interrupt Request. Open drain. Active low. This signal isasserted by the ST75C530/540 and negated by the host. RESET I Reset. Active low. INT/MOT I Select Intel or Motorola Interface II.3 - Analog Interface Pin Name Type Description TxA1 O Transmit Analog Output 1 TxA2 O Transmit Analog Output 2 RxA I Receive Analog Input SPK1P O Speaker Output 1, (differential positive), must be connected through Amplifier to the loudspeaker. SPK1N O Speaker Output 1, (differential negative) SPK2P O Speaker Output 2, (differential positive), must be connected through Amplifier to the Handset loudspeaker. SPK2N O Speaker Output 2, (differential negative) SPK3P O Speaker Output 3, (differential positive) SPK3N O Speaker Output 3, (differential negative) MIC1 I Microphone Input 1 MIC2 I Microphone Input 2 MIC3 I Microphone Input 3 VCM I/O Analog Common Voltage (nominal +2.5V). This input must be decoupled with respect to AGND. VREFN I Analog Negative Reference (nominal 1.25V). This input must be decoupled with respect to VCM. VREFP I Analog Positive Reference (nominal 3.75V). This input must be decoupled with respect to VCM. II.4 - General Purpose IO and Relay Pin Name Type Description GIO[0,7] I/O General Purpose I/O Pins, can be independently selected as input or output. GIO[10,17] I/O General Purpose I/O Pins, can be independently selected as input or output. RELAY0, RELAY1 OD Relay Outputs, Open Drain, Active Low. Can sink -10mA to RGND. RING I Ring detect signal. Active low. If the ST75C530/540 is in low power mode, a low level will awake the chip. This input is a Schmidt’s trigger. RGND PWR Relay Digital Ground. To connect to GND. II - PIN DESCRIPTION (continued) ST75C530 - ST75C540 6/84 |
类似零件编号 - ST75C540FP-A |
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类似说明 - ST75C540FP-A |
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