TDA5150 Datasheet, PDF (53/106 Pages) Infineon Technologies AG – On-chip, high resolution fractional-N synthesizer and Sigma-Delta modulator with ASK, FSK, GFSK options

TDA 5150
TDA 5150 Functional Description
Observe that this last wakeup condition is automatically fulfilled during communication
over the transmitter’s SPI-bus, assuming a standard, SPI-bus protocol is used.
SLEEP mode is entered:
• after a GO2SLEEP command execution, i.e by taking the EN pin to Low preceded by
setting of the GO2SLEEP bit in SFR TXCFG1 (0x05.7) to 1. This bit will be cleared
automatically on WAKEUP (i.e. on exiting the SLEEP state). There is a small latency
after the trailing edge of signal on EN pin (of 2 f_sys cycles) the time taken to close down
internal blocks.
SLEEP mode is left if the EN line is set to High level and there is clock activity (at least
3 pulses) on the SCK line. The conjunction of these 2 conditions will wake up the
transmitter and thus SLEEP Mode will be exited.
In SLEEP mode:
• Only the low power voltage regulator is ON
• Only the SPI interface is powered
• POR is ON
• BOD is in low power mode (inaccurate threshold)
• All other blocks are OFF.
• Power supply for digital core and SFR data is disconnected. As a consequence, SFR
register content is lost.
2.4.9.2 STANDBY Mode (Data Retention Mode)
STANDBY is a low power mode, but with higher consumption as SLEEP mode, due to
the fact that the SFRs are still supplied in this mode.
STANDBY is entered:
• whenever the EN line is low (no SPI communication), and the time-out count of
65536/ f_sys periods have been elapsed
• after a GO2STANDBY command execution (setting the GO2STANDBY bit in SFR
TXCFG0 (0x04.7) followed by taking the EN pin to Low (EN=0).
In STANDBY Mode:
• Only the low power voltage regulator is ON
• SPI, SFR container, and System Controller are supplied - data can be read into and
from the chip.
• POR is ON
• BOD is in low-power mode (inaccurate threshold)
• Data consistency of SFR container is monitored by means of parity bits
All other blocks are OFF.
Data Sheet
53
V 1.0, July 2009