MC33596FCESLASHR2 datasheet(24/70 Pages) FREESCALE

24 / 70 page

MC33596 Data Sheet, Rev. 4

Receive Mode

Freescale Semiconductor

11.4.2 Operation

Two modes of operation are available: sample mode and continuous mode.

11.4.2.1 Sample Mode

Sample mode allows the peak power of a specific pulse in an incoming frame to be measured.

The quasi peak detector is reset by closing S1. After 7

× Tdigclk, S1 is released. S2 is closed when RSSIC

is set high. On the falling edge of RSSIC, S2 is opened. The voltage on RSSIOUT is sampled and held.

The last RSSI conversion results are stored in the RSSI register and no further conversion is done.

The RSSI register is updated every 32

× Tdigclk. Therefore, the minimum duration of the high pulse on

RSSIC is 32

× Tdigclk.

Figure 16. RSSI Operation in Sample Mode

11.4.2.2 Continuous Mode

Continuous mode is used to make a peak measurement on an incoming frame, without having to select a

specific pulse to be measured.

The quasi peak detector is reset by closing S1. After 7

× Tdigclk, S1 is opened. S2 is closed when RSSIC

is set high. As long as RSSIC is kept high, S2 is closed, and RSSIOUT follows the peak value with a decay

time constant of 5 ms.

The ADC runs continuously, and continually updates the RSSI register. Thus, reading this register gives

the most recent conversion value, prior to the register being read. The minimum duration of the high pulse

on CONFB is 32

× Tdigclk.

Closed

7 x tdigclk

Updated

Frozen

Sampled and Hold RSSI Voltage

Peak Detector

Reset

Sampling

Open

Frozen

Open

Closed

RSSIC

RSSI Register

RSSIOUT

CONFB

MOSI

MISO

CMD

RSSI Value

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