ST25R3918 datasheet(105/141 Pages) STMICROELECTRONICS

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DS13490 Rev 2

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ST25R3918

Application information

140

4.5.51

TX driver timing register

Address: 29h

Type: RW

Table 78. TX driver timing register

Bit

Name

Default

Function

Comments

d_rat_t3

Driver transient ratio target

(in number of non-overlap times

in one RF period)

The value presents the target ratio between one RF

period and whole non-overlap time (both sides L to

H and H to L).

The system starts with the slowest available

transient and measures the ratio. If this is lower

than targeted the system switches to faster

transient. The procedure is repeated until the target

ratio is reached (or exceeded for the first time).

There are five steps available, procedure can take

up to ten RF periods.

d_rat_t2

d_rat_t1

d_rat_t0

d_tim_man

0: Use automatically acquired

timing setting

1: Use manual timing setting

d_tim_m2

000: Slow

001: Medium slow

010: Nominal

011: Medium fast

1xx: Fast

Manual driver timing, used if d_tim_man is set to 1.

1d_tim_m1

0d_tim_m0

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