1-22 (No.RA033<Rev.001>)
2.6.5.7
Power Supply and Reset Circuit
+B voltage is connected DC/DC converter IC (IC1), DC/DC converter IC (IC704), Voltage regulator IC (IC700), AMP switch (Q906)
through the fuse (F530).
IC1 regB voltage to 5V (50M).
PWRGD output of IC1 turns on the IC3, IC4, IC5, IC6 and IC10.
And, 50M provides the power to the panel unit LEDs and IC3, IC4, IC5, IC6 and IC10.
IC3 regulates 5V to 3.3V (33A). 33A provides the power to the Audio circuit blocks.
IC10 regulates 5V to 3.3V (33P). 33P provides the power to the PLL circuit blocks.
IC5 regulates 5V to 1.5V (15M). 15M provides the power to the MPU core (IC200).
IC6 regulates 5V to 1.6V (16D). 16D provides the power to the DSP core (IC150).
IC4 regulates 5V to 3.3V (33M). 33M provides the power to the MPU (IC200) and the DSP (IC150) and these peripheral blocks.
When 33M turn on, Voltage detector IC (IC8) is detected voltage up to2.9V.
And IC8 output is /RST signal of IC200. This /RST signal is connected to the hardware reset pin of MPU (IC200).
MPU (IC200) will turn on the IC700 and IC704 outputs A8ON signal and A8RST signal.
IC700 regB voltage to 3.3V (33BU).33BU provides the power to the IC706 and the Q706.
IC706 regulates 3.3V to 1.8V (18RTC).18RTC provides the power to the IC901 and the IC702.
A8RST signal turns on the Q706 via Q705. Q706 will switch to 33BU the power supply to the IC706 from the lithium-battery (CN706).
IC704 regB voltage to 3.8V (38M). 38M provides the power to the IC701 and the IC750.
IC701 regulates 3.8V to 3.3V (33D). 33D provides the power to the MPU (IC901) and these peripheral blocks.
IC750 regulates 3.8V to many output and many kind of voltage output. IC750 have a multiple of LDO output and three DC / DC con-
verter output, for IC901. However, one of the DC / DC converter in this is the 1.5V output (15DDR) for IC791.
In addition, VDD_MPU is DC / DC converter output, which is controlled voltage to 1.325V from 1.1V by the I2C communication of
IC901. VDD_CORE is a DC / DC converter output of 1.1V fixed output.
IC750 will be turned on by PWRHOLD signal. Then, when all of the output is turned on IC750 outputs NRESPWRON, to generate a
power-on reset signal of MPU (/PWRONRSTN).
After the power supply rises, IC200 controls the RF block and other power.
2.6.5.8
Power supply voltage monitoring circuit
This circuit always monitors the voltage of the +B.
IC7 is a voltage detect IC and is used to generate the /BiNT signal for the MPU (IC200). A /BiNT signal detects an under-voltage of
the +B voltage.
This /BiNT signal is connected to the interrupt pin of MPU (IC200). The software of the MPU (IC200) runs to the sleep-mode to use
the /BiNT signal.
IC906 is a voltage detect IC and is used to generate the /oVRB and /oVRB_2 signal. A /oVRB and /oVRB_2 signal detects an over-
voltage of the +B voltage.
This /oVRB signal is connected to the interrupt pin of MPU (IC200). The software of the MPU (IC200) runs to the sleep-mode to use
the /oVRB signal.
A /oVRB_2 protects IC707 from an overvoltage.
IC707, that, it'll be B_V_MoN signal at a buffer of the dB voltage. B_V_MoN signal is input to an A/D port in MPU (IC901), and
the +B voltage is always monitored.
Summary of Contents for NXR-5700
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