Panasonic TDA-600, Service Manual

Page: 29 / 133

8 EMPR CARD CIRCUIT OPERATION
8.1. EMPR CARD
8.1.1. Outline
1) Function
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System Control
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Circuit Switching (includes gain adjustment function)
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Conference Call (3 people x 8 ~ 8 people x 3)
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MOH
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PAGING
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Clock
2) Configuration
• • • • Power Supply: DC/DC Converter
• • • • CPU: HITACHI SH7750R (200MHz)
• • • • ASIC: Our own products
• • • • ROM: 8Mbit x 1 (for boot programs)
• • • • SDRAM: 256Mbit x 2 (for work area)
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SRAM: 16Mbit x 2 (for user data backup)
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SD card I/F (for operating programs) x 1
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USB I/F (for PC programming) x 1
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MOH: External sound input x 2
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PAGING: External output x 2
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Expanded memory connector x 1
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Modem card connector x 1
3) Operation Rating
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Power Input : +15V
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Internal Voltage
+15V (for MOH)
+3.3V (for I/O)
+3.3VBB (back board signal line pull-up)
+3.3VB (for SRAM, RTC backup)
+1.5V (for CPU core)
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KX-TDA600CE