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Furthermore, 3.3V output is also supplied to the following control system blocks.
· Power management IC (PWR MNG: IC1) for MPU/DSP (IC33)
· Terminal power supply for DDR3 (DDR3 TERM AVR: IC301)
· FPGA (IC65)
· ADC (IC76) etc.
And the 5V output of 3.3V, 5.0V DC/DC (IC4000) is supplied to the following circuits.
· Via 3.3V AVR (IC2001) to TX PLL (IC2000)
· 20V DC/DC (IC3011)
· 3.3V AVR (IC671)
· USB High-Side SW (IC251)
· 3.1V AVR (IC5) and the control system block
· 3.3V AVR (IC4005) and the receive 3.3V block
The power management IC (PWR MNG: IC1) is a dedicated IC for MPU/DSP (IC33) and supplies the various power required by IC33:
([V3_3USB], [VSDMMC], [V1_8PHY2], [V1_8PHY1], [V1_8PLL] / [V1_8PLLA] / [V1_8PLLB], [VDD_MPU], [1.15V_SMPS2],
[1.06V_SMPS3], [V1_8D], [VDDS_DDR])
When the power is turned on, IC4010 monitors [+ B] and if it is 17.4V or higher, Q4005 and IC4000 will not turn on, so the repeater
will not start.
When [+B] is 17.4V or less, the [MAIN_SHDN] signal becomes Hi and Q4005, IC4000 is turned on, so the repeater will start.
The FPGA (IC60) then turns on power management IC (PWR MNG: IC1) with the [ENABLE_PMIC] signal and supplies power to MPU/
DSP (IC33). Next, turn on each power supply of the RF circuit blocks by [5V_TX_EN], [5V_RX_EN], [LNA_ON], [10V_TX_EN]. These
are performed by command instructions from the MPU/DSP.
When [+ B] becomes 8.2V or less, BINT detector (BINT DET: IC300) generates Lo level interrupt signal [BINTS] / [BINTF] to MPU/
DSP (IC33) and FPGA (IC60), and the shutdown operation is started.
1-20 (No.RA094<Rev.002>)
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Troubleshooting
