Views: 0 Author: Site Editor Publish Time: 2023-11-15 Origin: Site
The circuit protection of PEPS smart keys mainly includes the following aspects:
1、Power management unit protection
The PEPS smart key is mainly powered by batteries (such as CR2302).When the environment changes, there may be a surge impact on the power supply terminal of the main control IC. It is recommended to use Yint Electronics transient suppression diode TVS SMF5.0CA for surge protection.
*Some parameters of Yint Electronics SMF5.0CA
Part Number (Bi) | Part Number (Uni) | Device Marking Code | Reverse Stand off Voltage VR (Volts) | Breakdown Voltage VBR (Volts)@IT | Test Current IT(mA) | Maximum Reverse Leakage IR @ VR(μA) | Maximum Peak Pulse Current I pp (A) | Maximum Clamping Voltage VC @ Ipp (V) | ||
BI | UNI | Min.V | Max.V | |||||||
SMF5.0CA | SMF5.0A | 5.0CA | 5.0A | 5.0 | 6.40 | 7.00 | 10 | 400 | 21.70 | 9.2 |
2、Button unit protection
The PEPS smart key retains the traditional RKE button unit, which is in line with the habits of many people. Figure 11 shows the circuit protection scheme that retains the unlock, lock, and trunk buttons. The button unit circuit may generate electromagnetic disturbances such as static electricity when the button is pressed, released, or detected by the human body, which is transmitted to the I/O port of the main control IC and affects the normal operation of the main control IC. At the TVS2/TVS3/TVS4 position between the button and the I/O port of the IC, Yint Electronics recommends using the electrostatic protection device YINT ESD5V0D5B, SOD523 small package to protect the button unit circuit.
*Yint Electronics ESD5V0D5B parameters
3、LF low frequency receiving module protection
The PEPS smart key is equipped with a low-frequency LF receiving module and a low-frequency antenna. It is recommended to use Yite Electronics' ultra-small package SOD923 or SOD882 packaged electrostatic protection devices ESD5V0D9B and ESD5V0D8B to protect the low-frequency receiving module from static electricity.
*Yint Electronics ESD5V0D8B parameters
4、RF radio frequency transmitting module protection
Similar to the high-frequency information receiving module of the PEPS base station, the PEPS smart key also requires electrostatic protection. Considering the space of the key, it is recommended to use Yint Electronics' ultra-low capacitance <1pF, ultra-small package SOD923 or SOD882 electrostatic protection device (such as ESDULC5V0D8B, SOD882,0.5pF) for circuit design.
*Some parameters of Yint Electronics ESDULC5V0D8B
