ZTEWelink ZM8620, Hardware Development Manual

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Hardware Development Guide of Module Product
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4.4.2 Requirement of Power Supply
The power supply is recommended to be within the range of 3.4~4.2V. If the network is in poor
situation, the antenna will transmit at the maximum power, and the transient maximum peak
current less than 2G mode can reach as high as 1.8A. So the power supply capacity for peak
current needs to be above 2.5A, and the average peak current needs to be above 0.9A.
4.5
(U)SIM Card Interface
4.5.1 Description of PINs
ZM8620 module baseband processor integrates the (U) SIM card interface, and supports to
automatically detect 3.0V/1.8V (U) SIM cards. And the module can support SIM hot-swap
function. The signals on SIM card interface is as shown in Figure 4-2.
ZM8620
LTE Modem
UICC_CLK
UICC_RESET
VREG_PWR_3P85
UICC_DATA
10pF 10pF 0.1uF 33pF
Figure 4-2 U(S)IM Card Signal Connection Circuit
Table 4-5 Definition & Description of (U) SIM Card Signal Group
PIN Protocol Signal Signal Definition Signal Description
16 UIM_PWR SIM card power USIM card power, output from the module
23 UIM_DATA SIM card data PIN USIM card DATA signal, two-way signal
17 UIM_CLK SIM card clock PIN USIM card clock signal, output from the module
18 UIM_RST SIM card reset PIN USIM card reset signal, output from the module
4.5.2 Electric Feature
The signals of (U) SIM card signal group are described in Table 4-5. On the line close to the (U)
SIM card socket, be sure to add the ESD circuit protection during the design.