nRF24E2 Nordic VLSI, nRF24E2 Datasheet - Page 32

• Manufacturer Part Number: nRF24E2
• Description: Single Chip RF Transmitter + MCU + ADC NRF2402 2.4GHz RF Transmitter
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
The A/D converter subsystem consists of a 12-bit analog to digital converter, a 9-input
analog multiplexer, a band gap reference and a power supply circuit. The AD
converter may be configured for 6, 8, 10 or 12 bit conversion. The AD converter is
interfaced to the microcontroller via 4 registers. ADCCON (0xA1) contains the most
commonly used control functions like channel and reference selection, power on and
start stop control. ADCSTATIC (0xA4) contains infrequently used control functions
that will normally not be changed by nRF24E2 applications. The high part of the
result is available in the ADCDATAH (0xA2) register, whereas the ADCDATAL
(0xA3) will hold the low part of the result (if any) and the end of conversion together
with overflow status bits.
The complete subsystem is switched off by clearing bit NPD (ADCCON.5). The AD
converter is normally clocked by the CPU clock divided by 32 (125 to 625 kHz), and
the ADC will produce 2 bits of result per clock cycle.
Figure 5-1 : Block diagram of A/D converter
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
VDD
AREF
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
1R
XO clock
2R
1/8
band
4
gap
ADCSEL
1.22V
EXTREF
single-
ended
diff
1/4
to
QhtrÃ"!ÂsÃ(
DIFFM
2
ADCCLK
ADCRES
BIAS
Vi+
Vi-
Vref
6-12bit
2bit/clk
A/D
SEQUENCE
CONTROL
CONTROL
ANALOG
START
CLK8
DATA
ADCUF/OF/RNG
12
EOC
CSTARTN
ADCRUN
BIAS_SEL
SLEEP
NPD
4
8
ADCSEL
ADCRES
DIFFM
DATA
DATA
ADC
ADC
H
L
STATIC
ADC
ADC
CON
CPU bus
August 2003