Diamond SmartLyte Plus - Power Circuits; Microcontroller; EMF and Noise Shielding; Fluid Pack Sensor

1 Introduction
ECO 9099 SOP05-5090F Rev.00 Effective Date: 12/20/18 Page 48 of 58
1.5.3. Power Circuits
Power is supplied to this circuit board through connector JP1 from the power supply
assembly. Check points are provided to measure supply voltages. The following list identifies
the check points.
TEST POINT
VOLTAGE
TEST POINT
VOLTAGE
TP1
+24V
TP2
+14V
TP3
+5V
TP4
+3.3V
TP5
2.5V
TP6
-14V
TP7
-2.5V
TP8
+12V
TP9
+2.048V
TP10
4.096V
TP11
+5V
TP12
+2.5V
TP13
NOT USED
TP14
-2.048
TP15
Ion-1
TP16
Ion-2
TP17
Ion-3
TP18
Ion-4
TP19
Ion-5 (NA)
TP20
Ion-6 (NA)
TP21
MFG Only
TP22
MFG Only
TP23
Sample Sensor
TP24
+5V
TP25
Temperature
TP26
+14V
TP27
GND
TP28
GND
TP29
MFG Only
TP30
MFG Only
1.5.4. Microcontroller
The STM32F407 microcontroller, represented as U12, can be located on the CPU board
(slight above & on right of the buzzer). This processor is preloaded with customized software
to control the peripherals – valve, pump, printer, RFID, signal processing, temperature
sensor, sample sensor and buzzer.
1.5.5. EMF and Noise Shielding
SMPS technology used to generate 24V DC supply from 110-220V AC supply. CPU board
has voltage regulator and switches to ±14V, ±2.048, ±5, ±2.5 and 3.3V. These linear
regulators and switches generate EMF noise which may interfere with sample analysis
resulting in inaccurate readings. For high accuracy and precision, the signal processing
amplifier on customized CPU is shield under using conductive metal shield plate. This shield
must be installed and covered for optimal performance.
1.5.6. Fluid Pack Sensor
SmartLyte
®
Plus uses standard fluids from pack for calibration, sample analysis, and waste
storage. To ensure that the fluid pack is present, an optical reflective sensor is mounted on
the CPU. The photo-detector signal is used to determine presence/absence of fluid pack.