NRF9E5 NORDIC SEMICONDUCTOR, NRF9E5 Datasheet - Page 45

• 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
14 PWM
The nRF9E5 PWM output is a one-channel PWM with a 2 register interface. The first
register, PWMCON, enables PWM function and PWM period length, which is the
number of clock cycles for one PWM period, as shown in the table below. The other
register, PWMDUTY, controls the duty cycle of the PWM output signal. When this
register is written, the PWM signal will change immediately to the new value. This can
result in 4 transitions within one PWM period, but the transition period will always have
a “DC value” between the “old” sample and the “new” sample.
The table shows how PWM frequency (or period length) and PWM duty cycle are
controlled by the settings in the two PWM SFR-registers. For a crystal frequency of 16
MHz, PWM frequency range will be about 1-253 kHz.
PWM is controlled by SFR 0xA9 and 0xAA.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.3
Addr
(hex)
SFR
AA
A9
(Number of bits)
PWMCON[7:6]
R/W
R/W
R/W
11
00 (0)
01 (6)
10 (7)
(8)
Table 35 PWM control registers - SFR 0xA9 and 0xAA.
#bit
8
8
Table 34 PWM frequency and duty-cucle.
(hex)
Init
0
0
f
f
f
XO
XO
XO
0 (PWM module inactive)
127
255
63
PWMCON
PWMDUTY
PWM frequency
PWMCON
PWMCON
PWMCON
Name
Page 45 of 108
1
1
1
5
5
5
0 :
0 :
0 :
PWM control register
7-6: Enable / period length select
5-0: PWM frequency prescale factor
PWM duty cycle (6 to 8 bits according to
period length)
1
1
1
(see table above)
00: Disable PWM
01: Period length is 6 bit
10: Period length is 7 bit
11: Period length is 8 bit
PWMDUTY
PWMDUTY
Function
PWMDUTY
(duty cycle)
PWMDUTY
127
255
63
0
5
6
0 :
0 :
June 2006