OL2385 datasheet(12/85 Pages) NXP

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OL2385

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Product data sheet

COMPANY PUBLIC

Rev. 1.0 — 15 June 2016

12 of 85

NXP Semiconductors

OL2385

Industrial RF transceiver

9.2 Power management

9.2.1 Modes of operation

The device supports operation in a 3 V, 5 V or a mixed 3 V and 5 V environment

supporting the following supply use cases:

1. Device and digital interface supplied with regulated 5 V supply

– Digital signaling between all devices in the system is done at 5 V level.

2. Device and digital interface supplied with regulated 3 V (3.3 V) supply

– Digital signaling between all devices in the system is done at 3 V (3.3 V) level.

3. Device supplied with regulated 3 V (3.3 V) supply and digital interface supplied with

regulated 5 V supply

– Digital signaling between all devices in the system is done at 5 V level.

4. Device and digital interface supplied with a single primary lithium battery cell (3.6 V …

1.9 V)

– Digital signaling between all devices in the system is done at the unregulated

battery voltage level.

5. Supply with a single rechargeable battery cell (4.2 V … 3.0 V) and an accompanied

voltage regulator (3.6 V … 2.5 V)

– Device is supplied with the regulated voltage.

– Digital signaling between all devices in the system is done at the unregulated

battery voltage level.

Connection diagrams for these different use cases are depicted in Figure 4.

9.2.2 External power supply domains

Several power supply pins are present to provide the required supply isolation between

various RF, analogue and digital blocks (external power supply domains). The power

supply pins have to be directly connected to a regulator output or a battery. External

supply switches are not required.

Adequate blocking capacitors have to be connected to the external supply pins.

Table 5.

External power supply domains

Power supply pin

Voltage range

Description

VDD_IO, GND_IO

3 V, 5 V

Main power supply domain of the device; supplies the I/O port pins, the

power-on reset circuit and an internal low-power regulator which

supplies the power state logic, the I/O port control latches, the polling

timer and the watchdog.

VDD_LO, GND_LO

3 V

Power supply for the local oscillator (fractional-N PLL).

VDD_XO, GND_XO

3 V

Power supply for the crystal oscillator.

VDD_RF, GND_RF

3 V

Power supply for the radio frontend including the LNA, the input

attenuators and the mixer for receive mode.

VDD_PA, GND_PA

3 V

Power supply for the power amplifier regulator output and the power

amplifier control for transmit mode.

VDD_ADC, GND_ADC

3 V

Power supply for the sigma-delta ADCs in the radio receiver.

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