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HL7588 Datasheet(PDF) 41 Page - List of Unclassifed Manufacturers

Part No. HL7588
Description  Product Technical Specification
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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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