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Direct Connection to a Microcontroller Configuration
9
Direct Connection to a Microcontroller Configuration
When a high level is applied on MODE1, the circuit is in configuration C (see Figure 26 ). The demodulated data are sent
through DOUT.
The AM pin is set as a VDD referenced input pin receiving the AM command. Forcing high and low levels on AM achieves the
amplitude modulation by switching on/off both antenna drivers. Meanwhile, this amplitude modulation can be monitored on
DOUT. This allows antenna short and open circuit diagnosis.
The circuit can be put into standby mode by applying a low level on the MODE2 pin. In standby mode, the oscillator and most
of the internal biasing currents are switched off. Therefore, the functions (tag reader and ISO 9141 interface) are inactive except
for the voltage regulator. The driver outputs TD1 and TD2 are frozen in their state (high or low level) before entering into
standby mode. DOUT forces a low level.
The ISO 9141 interface K is standalone and can be directly controlled by the input pin Tx and monitored by the output Rx.
Applying a logic high level on Tx switches the output driver K on (dominant zero state when an external pull-up resistor is
connected between K and VBAT). Applying a logic low level turns the driver off (one recessive state).
Rx monitors the voltage at the K pin. When the voltage is below the low threshold voltage, Rx forces a logic low level. When
the voltage is above the high threshold voltage, Rx forces a logic high level.
In standby mode, Tx is disabled and Rx output monitors the voltage at the K pin.
Reset
TD1/2
switching
AM low
AM high
AM high
TD1/2 off
Wake-up
AM low
mode2 low
mode2 low
mode2 high
Standby
Figure 10. Configuration C State Diagram
10
Electrical Characteristics
Typical values reflect average measurements at V SUP = 12V and T J = 25 ° C.
11
Supply Current
Typical values reflect average measurements at 6V ≤ V SUP ≤ 16V, V SS = 0V, T J = –40 ° C to + 125 ° C, unless otherwise noted.
MC33690 Standalone Tag Reader Circuit, Rev. 5
Freescale Semiconductor
13
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