Specifications

L506 Hardware Design
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L506
LED
VLED
R2
R1
Figure 3-22 Status indicator reference circuit
Note: R1, R2 value according to the voltage VLED and LED working current.
Table 3-21 NETLIGHT status
Net Status
Module working status
Always on
Searching Network/Call Connect
200ms ON, 200ms OFF
Data Transmit
800ms ON, 800ms OFF
Registered network
OFF
Power off / Sleep
Note: NETLIGHT output low level as “ON”, and high level as “OFF”.
3.12 SD card interface
3.12.1 Pin descriptions
L506provides a 4-bit SD/MMC interface with clock rate up to 52MHz. The operation voltage of
MMC/SD interface is 2.85V with SD/MMC memory cards up to 128G(FAT4), which is compatible
with SDIO Card Specification (version 3.0), Secure Digital (Physical Layer Specification, version 3.0)
and Multimedia Card Host Specification MMC (version 4.4)
Table 3-22 SD characteristics
Symbol
Parameter
Min.
Typ.
Max.
Unit
VDD_EXT**
LDO output
-
2.85
-
V
VIH
High-level input
voltage
0.625*VDD_
EXT
-
VDD_EXT+0.3
V
VIL
Low-level input
voltage
-0.3
0
0.25*VDD_EX
T
V