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HL7548 Datasheet(PDF) 41 Page - List of Unclassifed Manufacturers |
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HL7548 Datasheet(HTML) 41 Page - List of Unclassifed Manufacturers |
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41 / 53 page  4116369 Rev 9.0 September 04, 2017 41 Product Technical Specification Design Guidelines AT+KSLEEP=1 : • The module determines when it enters sleep mode (when no more tasks are running). • “0x00” character on the serial link wakes the module up. AT+KSLEEP=2 : The module never enters sleep mode. 5.4.2. Using USB Use AT+KSLEEP=1 to allows the module to automatically enter sleep mode while the USB interface is in use. 5.5. Power Supply Design The AirPrime HL7548 and HL7588 modules should not be supplied with voltage over 4.5V even temporarily or however briefly. If the system’s main board power supply unit is unstable or if the system’s main board is supplied with over 4.5V, even in the case of transient voltage presence on the circuit, the module’s power amplifier may be severely damaged. To avoid such issues, add a voltage limiter to the module’s power supply lines so that VBATT and VBATT_PA signal pads will never receive a voltage surge over 4.5V. The voltage limiter can be as simple as a Zener diode with decoupling capacitors as shown in the diagram below. Power Supply VBATT/VBATT_PA Figure 10. Voltage Limiter Example 5.6. ESD Guidelines for SIM Card Decoupling capacitors must be added according to the drawings below as close as possible to the SIM card connectors on UIM1_CLK, UIM1_RST, UIM1_VCC, UIM1_DATA and UIM1_DET signals to avoid EMC issues and to comply with the requirements of ETSI and 3GPP standards covering the SIM electrical interface. A typical schematic including SIM detection is provided below. |
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