NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 63

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Using the PLL circuit
The clock module has two power pins: PLLVDD and PLLVSS.
The BISTEN input is tied to 3.3 volts through a 10K resistor.
The SCANEN input is tied to 3.3 volts through a 10K resistor.
This diagram shows the hardware configuration:
The NS7520 can use its PLL external oscillator to generate the BCLK and FXTAL
signals. In this configuration, BCLK can be set to several values, in increments of 1/4
the crystal frequency. FXTAL us always the crystal frequency divided by five.
Connect to ground
to use boundary
scan testing
Tie high to use the
JTAG debugger
PLLVDD is connected to 1.5 volts
PLLVSS is connected to ground
The PLLTST* input is connected to ground to use boundary scan testing. It is
connected to 3.3 volts through a 10K resistor to use the JTAG debugger.
Oscillator
3.3V
1.5V
100 ohm
SCANEN (L13)
XTALA1 (K14)
XTALA2 (K12)
BISTEN (M15)
PLLVDD (L15)
PLLVSS (L12)
PLLTST(N15)
w w w . d i g i e m b e d d e d . c o m
FXTAL
BCLK
S Y S M o d u l e
5 1