NXP Semiconductors
JN5189
JN5189-DK006 Development Kit User Guide
UM11368
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User Guide
Rev.1.1
— 28 April 2020
14 of 21
6. JN5189 USB Dongle
The OM15080-JN5189 can be used as a node in a Zigbee as a Zigbee Control Bridge,
Zigbee Coordinator or packet sniffer. It can also be used in Thread wireless network,
typically dongle for Border Router, Network/Radio Co-Processor (NCP/RCP).
7. JN5189 current measurement
The JN5189 current can be measured:
1. Using the on-board current measurement circuit with MCUXpresso.
2. Measuring the voltage across a sense resistor (R51) in series with the supply,
3. A current meter on a modified DK6 board or a stand-alone module,
Each of these methods will be described in subsections below. When a board is
attached, attempting to measure the lowest possible power, the JN5189 IO pins must be
configured by software configuration to avoid any extra current from the JN5189 IO ports
that have external pull-up or pull-down resistors enabled. JP6 should be opened to avoid
leakage to the Link2 via the I2C and SPI connections between it and the JN5189.
7.1 Current measurement with MCUXpresso
The DK6 board has an on-board current measurement circuit consisting of a MAX9634T
(IC21) current monitor chip and a 12-bit ADC (ADC122S021, IC19) with a 12-bit sample
at 50k to 200ksps. The on-board MAX9634T current monitor measures the voltage
across the JN5189
VBAT Vsense resistor of 3.3Ω. The MAX9634 multiplies the sense
voltage by 25 to provide a voltage range suitable for the ADC to measure. The current
measurement circuit is controlled by the debug processor and is not user programmable.
Power measurement utilities to use this feature are available in the MCUXpresso IDE
installation.
Due to input offset voltage variations in the MAX9634, the current measurement circuit is
not recommended for measuring current below 150uA.
7.2 Vsense resistor measurement
The voltage across a series 3.3Ω resistor with the target JN5189 VBAT can be manually
measured at J14 on the PCB. The voltmeter positive probe is applied to J14 pin 1
(square pad) and negative probe to J14 pin 2. U
se Ohm’s law to calculate the current
Figure 9 JN5189 USB Dongle
