Novatel Wireless NRM-EU870D Manuale Utente
37
Novatel Wireless
Revision 1
CLK
CLK is driven by the ME. It is the system clock for the SIM. It may be used by the SIM as a
processor clock. The frequency of this signal is from 1 to 4 MHz. The clock is not continuously
running and is stopped in between data transfers.
See Table 4 for a summary of the 3GPP electrical requirements.
processor clock. The frequency of this signal is from 1 to 4 MHz. The clock is not continuously
running and is stopped in between data transfers.
See Table 4 for a summary of the 3GPP electrical requirements.
Table 4: CLK electrical requirements
Symbol Conditions Minimum
Maximum
Unit
V
OH
I
OHmax
= + 20 µA 0.7 x Vcc
Vcc
V
V
OL
I
OLmax
= - 20 µA
0
0.2 x Vcc
V
t
R
t
F
50
ns
IO
IO is the bi-directional data signal. The ME may drive this signal low, or may pull it up to VCC.
The SIM may drive this signal low, or it may pull it up to VCC. The pull-up on the HSDPA module
is described in the following figure.
The SIM may drive this signal low, or it may pull it up to VCC. The pull-up on the HSDPA module
is described in the following figure.
Figure 7: IO driver and pull-ups
The IO signal is much slower than the CLK signal. The default bit time is 372 clock periods.
Each data word is 10 bit times; a start bit, eight (8) data bits, and a parity bit. The data signal
may be direct convention (high voltage is a binary 1, LSB sent first) or inverse convention (low
voltage is a binary 1, MSB sent first) depending on the ATR.
See Table 5 for a summary of the 3GPP electrical requirements.
Table 5: IO electrical requirements
Symbol Conditions Minimum
Maximum
Unit
V
IH
I
IHmax
= ± 20 µA
0.7 x Vcc Vcc+0.3
V
V
IL
I
ILmax
= + 1 mA
- 0.3
0.2 x Vcc
V
V
OH
I
OHmax
= + 20 µA
0.7 x Vcc Vcc
V
V
OL
Vcc = 3V, I
OLmax
= - 1mA
0
0.4
V
V
OL
Vcc = 1.8V, I
OLmax
= - 1mA 0
0.3
V
t
R
t
F
1
µs
VPP
VPP is the programming voltage. It is not used and the SIM connector pin should not be
connected. The module pin is not connected.
Reserved