Nokia NHM-7 series, Service Manual, Page: 38 / 212

NHM–7
System Module & UI
PAMS Technical Documentation
Page 26 Issue 1 10/2001
Nokia Corporation
The data communication between the card and the phone is asynchro-
nous half duplex. The clock supplied to the card is in GSM system 1.083
MHz or 3.25 MHz. The data baud rate is SIM card clock frequency di-
vided by 372 (by default), 64, 32 or 16. The protocol type, that is sup-
ported, is T=0 (asynchronous half duplex character transmission as de-
fined in ISO 7816–3).
UEM
UPP
C5 C6 C7
C1 C2 C3
SIMDATA
Data
SIMClk
SIMCLK
SIMIO
SIMRST
VSIM
From Battery Type contact
SIMIO
SIMClk
Data
GND
GND
SIM
SIMIF
register
UEM
digital
logic
BSI
UIF Block
CBusDa
CBusEnX
CBusClk
C8
C4
UEMInt
The internal clock frequency from UPP CTSI block is 13 MHz in GSM.
Thus to achieve the minimum starting SIMCardClk rate of 3.25 MHz (as is
required by the authentication procedure and the duty cycle requirement
of between 40% and 60%) then the slowest possible clock supplied to the
SIM has to be in the GSM system clock rate of 13/4 MHz.
Buzzer
Buzzer is used to generate alerting tones and melodies to indicate incom-
ing call. It is also used to generate keypress and warning tones for the
user. Buzzer is controlled by PWM (Pulse Width Modulation) signal gener-
ated by the buzzer driver of the UEM. Target SPL is 100dB (A) at 5cm.
Internal Microphone
The internal microphone capsule is mounted in the bottom connector. Mi-
crophone is omnidirectional. The internal microphone is connected to the
UEM microphone input MIC1P/N. The microphone input is asymmetric
and microphone bias is provided by the UEM MIC1B. The microphone
input on the UEM is ESD protected. Spring contacts are used to connect
the microphone contacts to the main PCB.