Neoway WM620 - RING Pin; Figure 3-9 Reference Circuit of LED Indicator; Figure 3-10 Circuit for Brighter LED; Figure 3-11 RING Indicator for Incoming Call

WM620 Hardware User Guide
Copyright © Neoway Technology Co., Ltd
16
Figure 3-9 Reference circuit of LED indicator
Figure 3-10 Circuit for brighter LED
3.2.2 RING Pin
PIN
Name
I/O
Function
DC Characteristics (V)
51
RING
O
Ring output
Min
Typical
Max
-0.3
2.6
2.9
 Calling: Once a voice call is coming, UART output "RING" character strings and meanwhile the
RING pin outputs 250 ms high-level pulses at 4s period. After the call is answered, the low-level
pulse restores.
Figure 3-11 RING indicator for incoming call
 SMS: Upon receipt of SMS, the module outputs one 600 ms high-level pulse.
Figure 3-12 RING indicator for SMS
SIG_LED
WM620
1K
SIG_LED
WM620
10K
VCC
470
2K
R1
250ms 250ms
4S
600 ms