User Manual

MG260 Product Specification
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2.9.2.3 Serial links
Signal Pin I/O I/O type Level Comment
GPS Serial Link
GPS_ T X D 0 3 I CMOS 2.8 V
VIL ≤ 0. 3 x VCC
VI H ≥ 0.7 x VCC
GPS_ R X D 0 4 O 100K pull-up
VOL ≤ 0. 1 V
VO
H ≥ 1.6 V
GSM Serial Link
GSM _ T X D 1 59 I CMOS 2.8 V
VIL ≤ 0. 3 x VCC
VI H ≥ 0.7 x VCC
GSM _ RXD 1 52 O CMOS
2.8 V / 3 X
VOL ≤ 0. 1 V
VO
H ≥ 2.7 V
GSM _ CT S 1 57 O CMOS
2.8 V / 3 X
VOL ≤ 0. 1 V
VO
H ≥ 2.7 V
GSM _ R T S 1 50 I CMOS 2.8 V
VIL ≤ 0. 3 x VCC
VI H ≥ 0.7 x VCC
GSM _ D S R1 56 O CMOS
2.8 V / 3 X
VOL ≤ 0. 1 V
VO
H ≥ 2.7 V
GSM _ DT R 1 54 I CMOS 2.8 V
VIL ≤ 0. 3 x VCC
VI H ≥ 0.7 x VCC
GSM _ DCD 1 71 O CMOS
2.8 V / 2 X
VOL ≤ 0. 1 V
VO
H ≥ 2.7 V
GSM _ R I 1 74 O CMOS
2.8 V / 2 X
VOL ≤ 0. 1 V
VO
H ≥ 2.7 V
* wit h VC C= 1.8 V o r 2.8 V a cc o rding t o t h e t y pe of CMOS v o lt age
** 1.7 V f o r CMOS 1.8 V; 2.7 V for CMO S 2.8 V.
T h e r i s i ng t i m e a nd f a lli ng t i m e o f the reception signals (mainly GSM_RTS1) have to be less than 200 ns.