ISP1183BS STEricsson, ISP1183BS Datasheet - Page 11

• Manufacturer Part Number: ISP1183BS
• Manufacturer: STEricsson

Specifications of ISP1183BS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

ISP1183_3
Product data sheet
7.13 Power-on reset
The 6 MHz oscillator frequency is multiplied to 48 MHz by an internal PLL.
In the suspend state, the crystal oscillator and the PLL are switched off to save power.
The oscillator operation is controlled by using bit CLKRUN in the Hardware Configuration
register. CLKRUN switches the oscillator on and off.
The ISP1183 has an internal Power-On Reset (POR) circuit. The clock signal normally
requires 3 ms to 4 ms to stabilize.
The triggering voltage of the POR circuit is 0.5 V nominal. A POR is automatically
generated when V
Fig 5. Typical oscillator circuit
Fig 6. POR timing
t
t
1
2
V
: clock is running
: registers are accessible
DD(I/O)
0.5 V
0 V
DD(I/O)
Rev. 03 — 20 January 2009
goes below the trigger voltage for a duration longer than 50 μs.
POR
≤ 350 ms
ISP1183
t
1
Low-power USB Peripheral Controller with DMA
6
7
XTAL2
XTAL1
6 MHz
18 pF
18 pF
004aaa294
2 ms
© ST-NXP Wireless 2009. All rights reserved.
004aaa390
ISP1183
t
2
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