T5760 datasheet(20/32 Pages) ATMEL

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T5760 T5761

Rev. A2, 19-Oct-00

Preliminary Information

20 (32)

Table 10 Effect of the configuration word Lim_min

Lim_min *) (Lim_min < 10 is not applicable)

Lower Limit Value for Bit Check

Lim_min5

Lim_min4

Lim_min3

Lim_min2

Lim_min1

Lim_min0

(TLim_min = Lim_min y XLim y TClk)

21 (Default)

(TLim_min = 347 µs for fRF = 868.3 MHz and BR_Range0

TLim_min = 329 µs for fRF = 915 MHz and BR_Range0)

*) Lim_min is also be used to determine the margins of the data clock control logic (see chapter ’Data Clock’)

Table 11 Effect of the configuration word Lim_max

Lim_max *) (Lim_max < 12 is not applicable)

Upper Limit Value for Bit Check

Lim_max5

Lim_max4

Lim_max3

Lim_max2

Lim_max1

Lim_max0

(TLim_max = (Lim_max – 1) y XLim y TClk)

41 (Default)

(TLim_max = 677 µs for fRF = 868.3 MHz and BR_Range0,

TLim_max = 642 µs for fRF = 915 MHz and BR_Range0)

*) Lim_max is also be used to determine the margins of the data clock control logic (see chapter ’Data Clock’)

Conservation of the Register Information

The T5760/T5761 implies an integrated power-on reset

and brown-out detection circuitry to provide a mecha-

nism to preserve the RAM register information.

According to figure 30, a power–on reset (POR) is gener-

ated if the supply voltage VS drops below the threshold

voltage VThReset. The default parameters are pro-

grammed

into the configuration registers in that

condition. Once VS exceeds VThReset the POR is canceled

after the minimum reset period tRst. A POR is also gener-

ated when the supply voltage of the receiver is turned on.

To indicate that condition, the receiver displays a reset

marker (RM) at Pin DATA after a reset. The RM is repre-

sented by the fixed frequency fRM at a 50% duty-cycle.

RM can be canceled via a Low pulse t1 at Pin DATA. The

RM implies the following characteristics:

D fRM is lower than the lowest feasible frequency of a

data signal. By this means, RM cannot be misinter-

preted by the connected

µC.

D If the receiver is set back to polling mode via Pin

DATA, RM cannot be canceled by accident if t1 is ap-

plied according to the proposal in the section

’Programming the Configuration Registers’.

By means of that mechanism the receiver cannot lose its

tion via the reset marker RM.

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