Nokia RH-6 Series Baseband Description & Troubleshooting page 38

RH-6
6 - BB Description & Troubleshooting
UEM
VFLASH1
-
Accessory
Detect
+
Vhead
VFLASH1
4k7
MBUS
UPP
Signal flow on ACI line - ACI-ASIC accessory inserted
V
headInt
1
V
FLASH1
V
high
V
head_min
V
aci_detect
1
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 time-
frame, 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
Page 38
Company Confidential
VFLASH1
HookInt
47R
HeadInt
ProdTP7
VBAT
GenIo(0) en
Figure 19: Principle schematics of ACI Accessory and engine
RESET
a
2
2
a
3
Figure 20: ACI communication
© 2003 Nokia Corporation.
CCS Technical Documentation
PHONE
100K
47R
Voltage
Regulator
Learning Sequence
4
6
5
ACI Accessory
Insertion &
Removal
detection
ACI
Data
56K
ChargeGND
GND
ACI
ASIC
Vout
VCC
Normal
ACI communication
7
Issue 1 10/2003
a
9
9
8