2-7
CPU of main
control
Monitoring
CPU
Monitoring CPU
DCDC
TPS61175 18.9V
On/Off control circuit
ACDC
15V/1.33A
锂电池
7.4V/1600mAh
DCDC
TPS5420 5V
Lithium battery
charging circuit
LDO
SPX1117M3-L-3.3
Motor drive
Speaker drive
System 3.3 V
主控
CPU
Lithium batteriesx2
7.4V/1600mAh
Backup power supply
SPX5205M5-L-3.3/TR
RTC power supply
Backup alarm
circuit
VREF
ZR431
ADC calibration
LCD Backlight
Monitoring CPU
backup power supply
Backup power supply
TLV70450-5V
External DC input
10-16V/2-1.25A
VBUS
Block Diagram of Power System
Test points for key signals:
TP115 (ACDC_IN) is about 15V when tested with a multimeter.
TP113 (EDC_IN) is about 10V-16V when tested with a multimeter.
TP100 (BAT2) is about 6.8V-8.4V when tested with a multimeter (In dual battery
configuration).
TP99 (BAT1) is about 6.8V -8.4V when tested with a multimeter.
U14 PIN1 (VBUS) is about 6.4V-15.6V when tested with a multimeter.
TP108 (VPP) is about 6.4V-15.6V when tested with a multimeter.
TP91 (VCCB) is about 4.5V-5.2V when tested with a multimeter.
TP90 (VBB) is about 3.3V when tested with a multimeter.
TP92 (VCC) is about 5.0V when tested with a multimeter.
TP89 (VDD) is about 3.3V when tested with a multimeter.
TP57 (VMM) is about 18.9V when tested with a multimeter.
The main control part is responsible for functions such as LCD display driver,
speaker alarm circuit, nurse call, key management, and UART communication of the
monitoring CPU. The main control CPU uses the Cortex M3 core chip
STM32F103RGT6 (U5), and uses the Intel 8080 system bus interface as the display
driver interface. The speaker alarm circuit is composed of PWM wave modulation
circuit and power amplifier circuit. Q13, U3 and peripheral resistance are composed
of PWM wave modulation circuit. U4 is a voice amplifier chip with +5V power supply.
The nurse call is an extended function, which is interconnected with the hospital
alarm system through a special nurse call cable. Q2, Q8 and peripheral resistance
components are composed of a nurse call circuit. U16 is an EEPROM that uses the
I2C interface for storing historical records, calibration data and other information.
U23 and U24 are nor flashes that use SPI interfaces for storing drug libraries,
language libraries, and image resources. X3 is a 32.768 KHz crystal that provides
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