GL828 USB 2.0 SD/MMC Single Slot Card Reader Controller
3.3 Pin Descriptions
Table 3.2 - Pin Descriptions
GL828
Pin name
Type
Description
LQFP48 Pin
VDD18O
GND
4
5,9,12
6,11
7
P
P
Internal regulator 1.8V output
Analog ground
Analog power
AVDD
DM
P
A
A
A
USB D-
DP
8
USB D+
RREF
10
Reference resistor
12MHz/48MHz input. This pin can be connected to one terminal of crystal or
external 12MHz/48MHz clock source.
X1
X2
13
14
OSC
OSC
12MHz/48MHz output. This is another terminal of the crystal or NC when
using an external 12MHz/48MHz clock source is used to drive PLL.
DVDD
GND
15,26,35
P
P
P
Digital power 3.3V
Digital ground
16,27,34
VP5
25
36
17
18
23
Regulator 5V Input
PMOSO
TEST_MOD
EXTRSTZ
SD_CDZ
PMOS Power MOS 3.3V Output
I, pd
I, pu
Test mode selection
External reset. It is active low. The low pulse should be 1 us width at least.
B/I, pd SD& MMC Card detection. Normal High, active low.
40,43,37,29,28,
30,32,38
SD data 0~3
B/I, f
MMC data 0~7
D0~D7
SD_CLK
SD_WPZ
39
3
B/I, f
B/I, pu
B/I, f
SD/MMC CLK
SD Write Protect Detection. When no card is inserted, pull low. When SM or
SD card is inserted, the pin is pull up and active low.
SD_CMD
GPIO0~3
SK
41
SD/MMC CMD
41,48,47,46
B/I, pd GPIO0~3 / GPIO3 : Power LED
B/I, pd 93C46 Clock
19
20
21
22
CS
B/I, pd 93C46 CS
DO
B/I, pd 93C46 Data out
DI
B/I, pd 93C46 Data in / Access LED
Notation:
Type
A
Analog
B
Bi-directional
B/I
B/O
I
Bi-directional, default input
Bi-directional, default output
Input
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