MC33690DWE Freescale Semiconductor, MC33690DWE Datasheet - Page 8

• Manufacturer Part Number: MC33690DWE
• Description: IC STAND ALONE TAG READER 20SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33690DWE

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: Wide Supply Voltage Range
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ISO 9141 Physical Interface
also the input generating the internal reset signal. Applying a logic low level on this pin resets the circuit, all the internal flip
flops are reset, and drivers TD1/2 are switched on.
5
This interface module is fully compatible with the ISO 9141 norm describing the diagnosis line. It includes one transmitter
(pin K) and two receivers (pins K and AM).
The input stages consist of high-voltage CMOS triggers. The thresholds are ratiometric to VSUP. A ground referenced current
source (2.5µA typ.) pulls down the input when unconnected.
When a negative voltage is applied on the K or AM lines, the input current is internally limited by a 2k
with a diode.
A current limitation allows the transmitter to drive any capacitive load and protects against short circuit to the battery voltage.
An overtemperature protection shuts the driver down when the junction temperature exceeds 150°C (typ). After shutdown by
the overtemperature protection, the driver can be switched on again if the junction temperature has decreased below the
threshold and by applying an off/on command, coming from the demodulator in configurations A and B, or directly applied on
the input Tx in configuration C (see
The electromagnetic emission is reduced because of the voltage slew rate control (5V/µs typ.).
8
VBAT
C
Reset
ISO 9141 Physical Interface
C
1
VSUP
LVR
VDD
10mA
Table
MC33690 Standalone Tag Reader Circuit, Rev. 5
Figure 4. Voltage Regulator Block Diagram
4).
1 MHz oscillator
Voltage reference
Comparator
VDD
and biasing
generator
reset
+
-
Charge pump
-
+
P channel
N channel
LDMOS
SOURCE
MOS
GATE
VDD
Freescale Semiconductor
Ω
10mF 100nF
resistor (typ.) in series
C
2
C
3
VDD