SERIAL INTERFACE PROGRAMMING REGISTERS DEFINITION

1” ClockPike

CLOCK

DATA

STROBE

DB0(LSB)

Addressbit1

DB1

Addressbit2

DB2

Addressbit3

DB29

Cmdbit30

DB30

Cmdbit31

DB31(MSB)

Cmdbit32

TRF3762

The TRF3762 features a 3-wire serial programming interface that controls an internal, 32-bit shift register. There

are a total of 3 signals that need to be applied: the CLOCK (pin 3), the serial DATA (pin 4) and the STROBE (pin

5). The DATA (DB0-DB31) is loaded LSB first and is read on the rising edge of the CLOCK. The STROBE is

asynchronous to the CLOCK and at its rising edge the data in the shift register gets loaded onto the selected

internal register. The first four bits (DB0-DB3) is the address to select the available internal registers.

A.

The first 4 bits, DB(3-0), of data are Address bits. The 28 remaining bits, DB(31-4), are part of the command. The

command is little endian or lower bits first.

Figure 11. Serial Programming Timing Diagram

Register Address

REST

Charge Pump Current

Output Mode

OUTBUF

PD

Reference Clock Divider (RDiv)

Select

EN_SEL

BUFOUT

DB0

DB1

DB2

DB3

DB4

DB5

DB6

DB7

DB8

DB9

DB10

DB11

DB12

DB13

DB14

DB15

Reference Clock Divider (RDiv)

Anti Backlash

PFD_P

TRIS_C

CP_TE

Full Cal

OL

P

ST

Req

DB16

DB17

DB18

DB19

DB20

DB21

DB22

DB23

DB24

DB25

DB26

DB27

DB28

DB29

DB30

DB31

Figure 12. Register 1

10

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