AS3932 Просмотр технического описания (PDF) - austriamicrosystems AG

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AS3932

3D Low Frequency Wakeup Receiver

austriamicrosystems AG 

AS3932

Data Sheet - Detailed Description

Table 7. Default Values of Registers

Register

Name

Type

Default

Value

R4<7:6>

T_OFF

W

00

R4<5:4>

R4<3:0>

R5<7:0>

R6<7:0>

R7<7:5>

R7<4:0>

D_RES

GR

TS2

TS1

T_OUT

T_HBIT

W

01

W

0000

W 01101001

W 10010110

W

000

W

01011

R8<2:0>

T_AUTO

W

000

R9<6:0>

R10<4:0>

R11<4:0>

R12<4:0>

R13<7:0>

RSSI1

RSSI3

RSSI2

F_WAK

000000

R

R

R

WR

Description

T_OFF=00

T_OFF=01

T_OFF=10

T_OFF=11

T_AUTO=000

T_AUTO=001

T_AUTO=010

T_AUTO=011

T_AUTO=100

T_AUTO=101

T_AUTO=110

T_AUTO=111

Off time in ON/OFF operation mode

1ms

2ms

4ms

8ms

Antenna damping resistor (see Table 15)

Gain reduction (see Table 14)

2nd Byte of wakeup pattern

1st Byte of wakeup pattern

Automatic time-out (see Table 20)

Bit rate definition (see Table 18)

Artificial wake-up

No artificial wake-up

1 sec

5 sec

20 sec

2 min

15min

1 hour

2 hour

Reserved

RSSI channel 1

RSSI channel 3

RSSI channel 2

False wakeup register

8.3.3 Serial Data Interface (SDI)

This 4-wires interface is used by the Microcontroller (µC) to program the AS3932. The clock operation frequency of the SDI is 1MHz.

Table 8. Serial Data Interface (SDI) pins

Name

Signal

Signal Level

Description

CS

Digital Input with pull down

CMOS

Chip Select

Serial Data input for writing registers, data to

SDI

Digital Input with pull down

CMOS

transmit and/or writing addresses to select

readable register

SDO

Digital Output

CMOS

Serial Data output for received data or read

value of selected registers

SCLK

Digital Input with pull down

CMOS

Clock for serial data read and write

Note: SDO is set to tristate if CS is low. In this way more than one device can communicate on the same SDO bus.

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