RA4W1 datasheet(7/105 Pages) RENESAS

7 / 105 page

R01DS0359EJ0100 Rev.1.00

Page 7 of 105

Mar 31, 2020

RA4W1 Datasheet

1. Overview

Bluetooth low energy(BLE)

 On-chip RF transceiver and link layer compliant with the Bluetooth 5.0 Low Energy

specification

 Bit rates: 1 Mbps, 2 Mbps, 500 kbps, and 125 kbps

 LE Advertising extension support

 Includes an RF transceiver power supply (selectable as a DC-to-DC converter or linear

regulator)

 On-chip matching circuit to help reduce the number of external parts

 Transmission power: +4 dBm support

Table 1.8

Analog

Feature

Functional description

14-bit A/D Converter (ADC14)

A 14-bit successive approximation A/D converter is provided. Up to 8 analog input channels

are selectable. Temperature sensor output and internal reference voltage are selectable for

conversion. The A/D conversion accuracy is selectable from 12-bit and 14-bit conversion

making it possible to optimize the tradeoff between speed and resolution in generating a digital

value. See section 34, 14-Bit A/D Converter (ADC14) in User’s Manual.

12-bit D/A Converter (DAC12)

The 12-bit D/A Converter (DAC12) converts data and includes an output amplifier. See section

35, 12-Bit D/A Converter (DAC12) in User’s Manual.

8-bit D/A Converter (DAC8) for

ACMPLP

The 8-bit D/A Converter (DAC8) converts data and does not include an output amplifier. The

DAC8 is used only as the reference voltage for ACMPLP. See section 39, 8-Bit D/A Converter

(DAC8) in User’s Manual.

Temperature Sensor (TSN)

The on-chip temperature sensor determines and monitors the die temperature for reliable

operation of the device. The sensor outputs a voltage directly proportional to the die

temperature, and the relationship between the die temperature and the output voltage is linear.

The output voltage is provided to the ADC14 for conversion and can be further used by the end

application. See section 36, Temperature Sensor (TSN) in User’s Manual.

Low-Power Analog Comparator

(ACMPLP)

The Low-Power Analog Comparator (ACMPLP) compares a reference input voltage and

analog input voltage. The comparison result can be read by software and also be output

externally. The reference voltage can be selected from an input to the CMPREFi(i = 0,1) pin,

an internal 8-bit D/A converter output, or the internal reference voltage (Vref) generated

internally in the MCU.

The ACMPLP response speed can be set before starting an operation. Setting the high-speed

mode decreases the response delay time, but increases current consumption. Setting the low-

speed mode increases the response delay time, but decreases current consumption. See

section 38, Low Power Analog Comparator (ACMPLP) in User’s Manual.

Operational Amplifier (OPAMP)

The Operational Amplifier (OPAMP) can be used to amplify small analog input voltages and

output the amplified voltages. A differential operational amplifier unit with two input pins and

one output pin are provided. See section 37, Operational Amplifier (OPAMP) in User’s Manual.

Table 1.9

Human machine interfaces

Feature

Functional description

Segment LCD Controller (SLCDC)

The SLCDC provides the following functions:

 Waveform A or B selectable

 The LCD driver voltage generator uses an external resistance division method

 Automatic output of segment and common signals based on automatic display data register

read

 The LCD can be made to blink.

See section 44, Segment LCD Controller (SLCDC) in User’s Manual.

Capacitive Touch Sensing Unit

(CTSU)

The Capacitive Touch Sensing Unit (CTSU) measures the electrostatic capacitance of the

touch sensor. Changes in the electrostatic capacitance are determined by software, which

enables the CTSU to detect whether a finger is in contact with the touch sensor. The electrode

surface of the touch sensor is usually enclosed with an electrical insulator so that a finger does

not come into direct contact with the electrode. See section 40, Capacitive Touch Sensing Unit

(CTSU) in User’s Manual.

Table 1.7

Communication interfaces (2 of 2)

Feature

Functional description

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