JN5148/001,531 NXP Semiconductors, JN5148/001,531 Datasheet - Page 12

• Manufacturer Part Number: JN5148/001,531
• Description: Microcontrollers (MCU) 32bit RISC 2.4GHz
• Manufacturer: NXP Semiconductors

Specifications of JN5148/001,531

• Core: RISC
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-56
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

2.2 Pin Descriptions
2.2.1 Power Supplies
The device is powered from the VDD1 and VDD2 pins, each being decoupled with a 100nF ceramic capacitor. VDD1
is the power supply to the analogue circuitry; it should be decoupled to ground. VDD2 is the power supply for the
digital circuitry; and should also be decoupled to ground. A 10uF tantalum capacitor is required. Decoupling pins for
the internal 1.8V regulators are provided which require a 100nF capacitor located as close to the device as practical.
VB_RF, VB_A and VB_SYNTH should be decoupled with an additional 47pF capacitor, while VB_RAM and VB_DIG
require only 100nF. VB_RF and VB_RF2 should be connected together as close to the device as practical, and only
require one 100nF capacitor and one 47pF capacitor. The pin VB_VCO requires a 10nF capacitor in parallel with a
47pF capacitor. Refer to B.4.1 for schematic diagram.
VSSA, VSSS, VSS1, VSS2, VSS3 are the ground pins.
Users are strongly discouraged from connecting their own circuits to the 1.8v regulated supply pins, as the regulators
have been optimised to supply only enough current for the internal circuits.
2.2.2 Reset
RESETN is a bi-directional active low reset pin that is connected to a 40kΩ internal pull-up resistor. It may be pulled
low by an external circuit, or can be driven low by the JN5148 if an internal reset is generated. Typically, it will be
used to provide a system reset signal. Refer to section 6.2, External Reset, for more details.
2.2.3 32MHz Oscillator
A crystal is connected between XTALIN and XTALOUT to form the reference oscillator, which drives the system
clock. A capacitor to analogue ground is required on each of these pins. Refer to section 5.1 16MHz System Clock
for more details. The 32MHz reference frequency is divided down to 16MHz and this is used as the system clock
throughout the device.
2.2.4 Radio
The radio is a single ended design, requiring a capacitor and just two inductors to match to 50Ω microstrip line to the
RF_IN pin.
An external resistor (43kΩ) is required between IBIAS and analogue ground to set various bias currents and
references within the radio.
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JN-DS-JN5148-001 1v6
© NXP Laboratories UK 2010