Motorola Astro Xts5000 Detailed 6881094c31 E Manual
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November 16, 20066881094C31-E 3-22Theory of Operation: VOCON Board 3.2.2.2 Static RAM (SRAM) U403 The static RAM (SRAM) IC U403 is an asynchronous, 1 MB, CMOS device that is capable of 70 ns access speed. It is supplied with 1.8 volts. The SRAM has its 19 address lines and 16 data lines connected to the EIM of the Patriot IC through the Address(23:0) and Data(15:0) busses. The SRAM has an active-high chip select CS2 that is tied directly to the 1.8 V supply and an active- low chip select CS1 that is...
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6881094C31-ENovember 16, 2006 Theory of Operation: VOCON Board3-23 Figure 3-9. Patriot EIM and Memory Block Diagram Dual-Core Processor U401Flash U402 SRAM U403 RESET_OUT LBA_N CS0_N EB1_N OE_N A(23:0) D(15:0) EB0_N CS2_N RW_NVoltage TranslatorRESET ADV EN_CE EN_WE EN_OE A(22:0) D(15:0) A(18:0) D(15:0) EN_OE LB UB CS1 EN_WE CSO A(23:1) A(19:1) CS2 R_W MAEPF-27414-A
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November 16, 20066881094C31-E 3-24Theory of Operation: VOCON Board 3.2.3 Audio and Power The audio and power section contains the following components: • GCAP II IC U501 • 5 V regulator U505 • 1.55 V regulator (NNTN4717 VOCON board only) • Audio pre-amplifier U502 • Audio power amplifier U503 • EEPOT U509 • MAKO IC U501 (for kit NNTN5567A) •VSW1 Driver IC Q502 (for kit NNTN5567A) The GCAP II IC contains a CODEC, amplification, filtering and multiplexing capability for receive and transmit audio, voltage...
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6881094C31-ENovember 16, 2006 Theory of Operation: VOCON Board3-25 The VSW2 regulator is a SPI programmable switching regulator that uses VSW1 as its input on pin PSRC2. The initial output of VSW2 (R501) is 2.2 volts, which is then programmed to 1.875 volts (referred to as 1.8 volts throughout this document). The VSW2 voltage is supplied to the Patriot IC (core voltage and the EIM voltage), the SRAM U403, the Flash memory U402, and the display module connector J301 (1.8 V display interface only for...
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November 16, 20066881094C31-E 3-26Theory of Operation: VOCON Board 3.2.3.2 5 V Regulator U505 The 5 V regulator uses UNSW_B+ as its input voltage. The Flipper IC WDI line controls the regulators SHUTDOWN pin. The 5 V supply (R503) is used by the Flipper IC U301, audio pre- amplifier U502, microphone bias circuitry (R531 and R563), Flipper IC protection diodes, bi- directional voltage translators, battery data-line isolation circuitry, and ESD protection circuitry. 3.2.3.3 1.55 V Regulator The 1.55 V...
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6881094C31-ENovember 16, 2006 Theory of Operation: VOCON Board3-27 3.2.3.6 EEPOT U509 The EEPOT is a digitally programmable potentiometer with 256 taps and a total resistance of 50 kohms. This 10-pin package contains two independent potentiometers, one for each microphone line. The EEPOT resistance values are programmed by the Patriot IC GPIOs EEPOT_INC* (U509 pin 9) and EEPOT_U_D* (U509 pin 2). The EEPOT_INC* signal increments the resistance value up or down, which depends on the EEPOT_U_D* signal....
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November 16, 20066881094C31-E 3-28Theory of Operation: VOCON Board 3.2.3.7.3 Audio Circuitry A16-bit CODEC is integrated into the MAKO IC and programmable by the dual-core processor through the SPI bus. The CODEC converts microphone audio data into a digital bit stream for processor by the DSP and converts receive audio data that was processed by the DSP into an analog audio signal for amplification to a speaker. The CODEC interfaces to the DSP through the 4- wire SAP bus. The CODEC clock, which is...
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6881094C31-ENovember 16, 2006 Theory of Operation: VOCON Board3-29 The Flipper IC contains a USB transceiver, switching logic between RS232 and boot data path, One- Wire side connector support, and several clock generators. The Flipper IC is programmed by the Patriot IC. ESD protection devices include zener diodes and low-capacitance ESD suppressors. Side connector interface circuitry includes current-limiting resistors and noise-suppressing shunt capacitors. 3.2.4.1 Flipper IC U301 See Figure 8-64,...
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November 16, 20066881094C31-E 3-30Theory of Operation: VOCON Board When a USB cable is detected, the USB_DIS pin (Q302 pin 2) goes high. This controls the isolation switch Q301 so that the data that is on those lines are routed to the USB transceiver. If a USB cable is not detected, the USB_DIS pin is low and the USB transceiver on the Flipper IC is isolated from the side connector. This isolation is done primarily because the RS232 data lines are 5 V lines, so the switch protects the transceiver...
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6881094C31-ENovember 16, 2006 Theory of Operation: VOCON Board3-31 3.2.4.1.6 13 MHz Reference Generation for GCAP II The 13 MHz reference is required by the GCAP II IC for the CODEC time base and the SSI clock generator module internal to the Flipper IC. A phase locked loop (PLL) is used to generate the 13 MHz using the 16.8 MHz clock, which is provided to the Flipper IC REF_16_IN pin (C307). An external RC loop filter network, consisting of R301, C301, and C302, is connected to the PLL_LFT pin. The...