mc33690dw Freescale Semiconductor, Inc, mc33690dw Datasheet - Page 10

• Manufacturer Part Number: mc33690dw
• Description: Standalone Tag Reader Circuit Starc
• Manufacturer: Freescale Semiconductor, Inc

© Motorola, Inc., 2002.
STANDALONE CONFIGURATION WITH ONE WIRE BUS
and MODE2, the circuit is in configuration A
(standalone single wire bus configuration, see
figure 13 page 18).
After power on, the circuit is set into read mode.
The demodulator output is directly routed to the
ISO 9141 interface output K.
The circuit can be set into write mode at anytime
by violation of all possible patterns on the single
wire bus during more than 1ms. Then the K line
achieves the amplitude modulation by switching
on/off both antenna drivers.
After 1ms of inactivity at the end of the challenge
phase (bus in idle recessive one state), the circuit
is set back into read mode.
Read to write mode :
K line
Write to standby mode :
Write to read mode :
K line
K line
K line
Standby mode to read mode :
When a low level is applied on pins MODE1
reset
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standby mode
read mode
write mode
write mode
Figure 6 : Mode access description in one wire bus configuration
read
wake up
T
T
0
0
T
Freescale Semiconductor, Inc.
≤ K line high
≤ K line low
0
Figure 7 : Configuration A state diagram
≤ t < T
t
t ≥T
For More Information On This Product,
≥
MOTOROLA SEMICONDUCTORS PRODUCTS
T
0
1
0
’+T
T
1
Go to: www.freescale.com
’
1
K
≤ K line low
wake-up sequence
TD1/2 off
MC33690
write
K line low
standby
10
The circuit can be put into standby mode by
forcing the K line at zero during more than 2 ms
after entering the write mode. Once the K line is
released, the circuit sends an acknowledge pulse
before entering into standby mode.
In standby mode, the oscillator and most of the
internal biasing currents are switched off.
Therefore, the functions (tag reader, ISO 9141
driver) are inactive except the voltage regulator
and the ISO 9141 receiver on pin K. The driver
output TD1 forces a low level and TD2 a high
level. A rising edge on K wakes up the circuit.
After completion of the wake-up sequence, the
circuit is automatically set in read mode.
In configuration A, DOUT and Rx outputs always
force a low level, Tx is disabled.
1
T
K line high < T
2
acknowledge
1
switching
T
TD1/2
write
2
1
0
’
0
revision 4.8, 5 February 2002
standby mode
read mode
write mode
read mode
0
0