NCN5150NGEVB
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ELECTRICAL CHARACTERISTICS
Table 1. ELECTRICAL CHARACTERISTICS OF THE NCN5150SOICGEVB AND NCN5150QFNGEVB BOARD
Symbol
Parameter / Condition
Value
Unit
Min
Typ
Max
Bus Voltage
V
BUS
Bus Voltage
12
36
42
V
Current Drawn from the Bus
I
BUS
1 UL
1.3
1.5
mA
Output Voltage
V
DD
LDO output
3.1
3.3
3.6
V
NCN5150 DESCRIPTION
The NCN5150 provide a complete transceiver for the
Metering Bus (M-BUS)
.
It consists of a transmit block
which will translate the logic level uart input to current level
signaling on the bus, and a receive block which will translate
the voltage-level signaling on the bus to a logic-level uart
output. The device includes an echo function which will
echo the uart input on the uart output, provided the device is
powered. This can be used by the software stack to monitor
if the message was transmitted. The high voltage level of the
microcontroller interface can be changed by connecting the
desired voltage to the VIO pin. By default, this pin is
connected through a 0R resistor to 3.3 V on the evaluation
boards.
A constant current regulator that will draw a fixed current
from the bus, expressed in unit loads (UL). This current is
made available to the application through a low-dropout
3.3 V regulator. The NCN5150 will detect when the bus is
disconnected and provide an early warning to the
microcontroller that the 3.3 V supply is about to collapse
through the PFb pin.
A thermal shutdown protects the device against high
junction temperatures.
NCN5150SOICGEVB DESCRIPTION
General Overview
The NCN5192NGEVB evaluation board demonstrates
the external components required for the operation of the IC.
We will cover the different sections below as well as possible
alternatives. A drawing of the board where the different
sections are indicated is shown below.
Figure 2. Board Drawing with Indication of Different Sections
Loop I/F
NCN5150
UART I/F
STC Capacitor
Test I/F
Loop I/F
