HT82K75REW datasheet(46/103 Pages) HOLTEK

46 / 103 page

HT82M75REW/HT82K75REW

Rev. 1.00

June 11, 2010

RF Transceiver Power-on and Reset Characteristics

The RF Transceiver has built-in power-on reset (POR)

circuit which automatically resets all digital registers

when the power is turned on. The 32MHz oscillator cir-

cuit starts to lock frequency of the right clock after

power-on. The whole process takes 3ms for a clock cir-

cuit to become stable and completes the power-on re-

set. It is highly recommended that the user waits at least

3ms before starting to access the RF Transceiver.

The RF Transceiver hardware reset signal (warm start)

named RST is controlled by MCU I/O pin and internally

pulled high with 33k

W resistor connected to VCC within

the RF Transceiver. The RF Transceiver will hold in re-

set state around 20

ms after RST signal is released from

the low state.

RF Transceiver Crystal Parameter Specifications

The RF Transceiver utilizes external 32MHz crystal to

generate the oscillation for RF Transceiver input clock.

The associated pins are XTAL_P and XTAL_N. The ta-

ble below lists the parameters of the crystal oscillator

used in the RF Transceiver. To operate the RF Trans-

ceiver properly, user has to select the crystal which

meets the following requirements.

Parameters

Min.

Typ.

Max.

Unit

Crystal Frequency

MHz

Frequency Offset

-40

ppm

Load Capacitance

¾¾

Recovery Time

¾¾

180

32 MHz crystal oscillator recovery time highly depends

on the shunt capacitance of 32 MHz crystal. The lower

shunt capacitance value makes the recovery time

shorter. This recovery time 180

ms is measured with 32

MHz crystal by NDK NX3225SA.

RF Transceiver Functional Description

The RF transceiver integrates receiver, transmitter, volt-

age-controlled oscillator (VCO), and phase-locked loop

(PLL). It uses advanced radio architecture to minimize

the external component count and the power consump-

tion. The Baseband/MAC block provides the hardware

architecture for both MAC and PHY layers. It mainly

consists of TX/RX control and digital signal processing

module. Interconnection between the MCU and the RF

Transceiver is implemented by internally connecting the

MCU Master SPI interface to the RF Transceiver Slave

SPI interface. All data transmissions and receptions be-

tween MCU and RF Transceiver including RF Trans-

ceiver commands are conducted along this

interconnected SPI interface. The RF Transceiver func-

tion control is executed by the MCU using its SPI Master

serial interface. The RF Transceiver contains its own in-

dependent interrupt which can be used to indicate when

a wake-up event occurs, an available packet reception

occurs or when a packet transmission has successfully

terminated or retransmission is timed out.

RF Transceiver Internal Connection

In addition to the RF Transceiver external pins de-

scribed above there are other MCU to RF Transceiver

interconnecting lines that are described in the above RF

Transceiver Pin Description table. Note that these lines

are internal to the device and are not bonded to external

pins.

The RF Transceiver is composed of several functional

blocks named Interfacing block, Lower MAC block,

Memory block, Power Management block and PHY

block. The detailed functions of the functional blocks are

described in the following sections.

V D D

V C C

V D D _ R F

S C L K

S I

S O

S E N

I N T

R S T

S C K

S D O

S D I

S C S

I N T

I / O

V D D

V S S

G N D

G P I O 0

G P I O 1

G P I O 2

R F _ P

R F _ N

X T A L _ P

X T A L _ N

R F

T r a n s c e i v e r

M C U

MCU to RF Transceiver Internal Connection

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