ISP1181BBSUM STEricsson, ISP1181BBSUM Datasheet - Page 42

• Manufacturer Part Number: ISP1181BBSUM
• Manufacturer: STEricsson

Specifications of ISP1181BBSUM

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Compliant

14. Power supply
15. Crystal oscillator and LazyClock
CD00222684
Product data sheet
Fig 9.
ISP1181B with a 4.0 V to 5.5 V supply.
ISP1181B
V reg(3.3)
V CC(3.3)
V CC
V ref
The ISP1181B is powered from a single supply voltage, ranging from 4.0 V to 5.5 V. An
integrated voltage regulator provides a 3.3 V supply voltage for the internal logic and the
USB transceiver. This voltage is available at pin V
resistor on USB connection D+. See
The ISP1181B can also be operated from a 3.0 V to 3.6 V supply, as shown in
In this case, the internal voltage regulator is disabled and pin V
to V
The ISP1181B has a crystal oscillator designed for a 6 MHz parallel-resonant crystal
(fundamental). A typical circuit is shown in
signal of 6 MHz can be applied to input XTAL1, while leaving output XTAL2 open.
The 6 MHz oscillator frequency is multiplied to 48 MHz by an internal PLL. This frequency
is used to generate a programmable clock output signal at pin CLKOUT, ranging from
3 MHz to 48 MHz.
In ‘suspend’ state the normal CLKOUT signal is not available, because the crystal
oscillator and the PLL are switched off to save power. Instead, the CLKOUT signal can be
switched to the LazyClock frequency of 100 kHz ± 50 %.
The oscillator operation and the CLKOUT frequency are controlled via the Hardware
Configuration Register, as shown in
Fig 11. Typical oscillator circuit.
•
•
•
CC
CLKRUN switches the oscillator on and off
CLKDIV[3:0] is the division factor determining the normal CLKOUT frequency
NOLAZY controls the LazyClock signal output during ‘suspend’ state.
004aaa140
.
4.0 V to 5.5 V
Rev. 05 — 25 August 2010
ISP1181B
CLKOUT
Fig 10. ISP1181B with a 3.0 V to 3.6 V supply.
XTAL2
XTAL1
Figure
Figure
Figure
12. The following bits are involved:
9.
6 MHz
18 pF
18 pF
ISP1181B
reg(3.3)
11. Alternatively, an external clock
Full-speed USB peripheral controller
V reg(3.3)
V CC(3.3)
V CC
V ref
004aaa142
for connecting an external pull-up
reg(3.3)
004aaa141
3.0 V to 3.6 V
© ST-ERICSSON 2010. All rights reserved.
ISP1181B
must be connected
Figure
42 of 68
10.