Fig 36 Aci Diagram - Nokia NPL-4 Series Troubleshooting Instructions

Nokia Customer Care
V
headInt
1
V
FLASH1
V
high
V
head_min
V
aci_detect
V
low
1. Accessory is connected (insertion & removal resistor connect to ACI line)
1a) phone gets HeadInt interrupt after 20ms check that ACI line is still low (<Vhead min)
2. Connect MBUS with HeadInt line (MBUS switch)
2a) If the phone detect a HeadInt interrupt from low to high transition in 20ms timeframe, then an advanced
accessory is connected
3. ACI chip reset (3000- 4000us)
4. Power up delay (50-400us)
5. Start bit (50us)
6. Learning sequence (567-1700us)
7. ACI communication
8. MBUS is disconnected from HeadInt line (MBUS switch). After every communication.
9. Accessory is removed (no insertion & removal resistor on ACI line)
à phone gets HeadInt interrupt from ACI line low to high transition.
9a) If no HeadInt interrupt comes in the next 100ms the accessory is really removed and the phone goes in the
state "no accessory".
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential
Figure 36: ACI Diagram
RESET
a
2
2
a
1
3
Troubleshooting Instructions
Learning Sequence
4
6
5
NPL-4/5/
Normal
a
9
ACI communication
9
7
8
Page 83