NRF9E5 NORDIC SEMICONDUCTOR, NRF9E5 Datasheet - Page 14

• Manufacturer Part Number: NRF9E5
• Description: TRX, 430-928MHZ, MCU/ADC/PWM, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF9E5

• Receiving Current: 12.5mA
• Transmitting Current: 30mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
5 SYSTEM CLOCK
The Microcontroller clock, CPU_CLK, is generated from the on chip crystal oscillator.
CPU_CLK frequency is configured in the RF-configuration register (see chapter 11) and
could be set to 0.5, 1, 2 or 4MHz. CPU_CLK could in addition be set equal to the crystal
oscillator frequency itself. The CPU_CLK generation is illustrated in Figure 3.
It is important to always set XOF equal to the actual crystal selected for the application.
The SFR 0xBF, CKLFCON, have to correspond with XOF, UP_CLK_FREQ and
XO_DIRECT. SFR 0xBF is described in Table 43 on page 53.
Default values of UP_CLK_FREQ and XO_DIRECT is '00' and '0' respectively. That is,
the default CPU_CLK frequency is 4MHz.
The chip has an internal low frequency clock that is always active. This clock ensure
proper operation of vital function when the chip is in power down mode and the crystal
oscillator is turned off, please see chapter 16 on page 53.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.3
XO
f
XO
Figure 3 CPU_CLK generation in nRF9E5.
Divide 1 to 5
XOF
4MHz
Page 14 of 108
Divide 1 to 4
UP_CLK
_FREQ
0.5 - 4MHz
XO_DIRECT
1
0
MUX
0.5 to 20MHz
f
CPU_CLK
June 2006