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TRC104

2.4 GHz RF Transceiver

Murata Manufacturing 

-42 dBm. If RSS_G is 1, the RSSI covers the received signal strength range of -55 to -2 dBm. The RSSID value

is also compared to the RSSI_thr threshold value of register 0x03.

If the digital value is greater than the threshold value, the RSSID pin is asserted according to the configuration of

the LVLDRSSI bit of register 0x17. If the LVLDRSSI bit is set to 1, the RSSID pin is asserted high, otherwise the

pin is asserted low. The output state of the RSSID pin is disabled while MODE is asserted. The RSSI function is

only available in continuous mode, as discussed below.

4 Operating Modes

The TRC104 can operate in one of five modes: Sleep, Stop, Stand-by, Configuration or Active TX/RX. Figure 8

details the state transitions between the operating modes.

T R C 1 0 4 O p e r a tin g M o d e S ta te D ia g r a m

T X /R X

S le e p

S to p

S ta n d b y

C o n fig

Figure 8

There are three input pins that determine the operating mode for the TRC104. The states of these pins are shown

in Table 9 and associated timing diagrams are provided in the Sections below where needed.

4.1 Sleep Mode

Operating Mode

Pin State

PMODE CS MODE

Sleep Mode

Stop Mode

0

X

1

0

0

0

Standby Mode

1

Configuration Mode

1

Transmit Load/Receive Mode

1

Burst Transmit

1

0

0

1

0

0

1

0 1→0

X – Don’t Care

Table 9

Sleep Mode provides the lowest TRC104 current consumption, typically less than 0.4 µA. No serial transactions

can occur while in Sleep Mode. The contents of the FIFO and the internal configuration registers are not

maintained in Sleep Mode. When waking from Sleep Mode the TRC104 executes a power-up reset, which takes

120 ms. Any operation to the TRC104 must wait until the reset period is complete. Following a sleep cycle,

configuration registers must be rewritten to utilize operating parameters other than the power on default settings.

Figure 9 demonstrates the states of the mode control pins and the timing related to Sleep Mode. For minimum

current consumption, hold the SDAT, SCLK, INT and RSSID pins low in this mode. 100K pull-down resistors can

be used for this purpose.

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TRC104 (R) 04/27/15

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