TDC-GPX2 datasheet(46/77 Pages) AMSCO

46 / 77 page

Page 46

ams Datasheet

Document Feedback

[v1-03] 2017-Dec-18

TDC-GPX2 − Detailed Description

Initialization Reset

After the configuration, the initialization opcode

spiopc_init=0x18 resets again the chip to power on state, but

preserves the configuration and starts the measurement. The

initialization reset can be send while the reference clock or

stops are applied. It takes 16 pulses of the reference clock before

the stop channels are opened internally. After the initialization

reset the delay tPOR has to be waited before next

communication. The initialization reset can be applied also

during measurements to restart the chip, but preserves

measured data in FIFOs.

Figure 49:

Initialization Reset Opcode

Write / Incremental Write

Write access is permitted to the configuration registers

exclusively. The access starts by sending the opcode spiopc_

write_config = 0x80 after a positive SSN pulse. The register

address is just added to spiopc_write_config. The data are sent

after the opcode. Incremental write access to the successive

registers is possible by sending the next data bytes. A complete

configuration starts normally at register 0, followed by all

Figure 50:

SPI Incremental Write

SSN

SCK

MOSI

Opcode 0x18

A4A3A2 A1 A0

SSN

SCK

MOSI

D7 D6 D5 D4 D3 D2 D1 D0

Data byte of addressed register

Opcode

Data byte of next register

TDC-GPX2 Datasheet(PDF) 46 Page - ams AG