參數(shù)資料
型號(hào)： PXAS37KFBE
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： XA 16-bit microcontroller 32 K/1 K OTP/ROM/ROMless, 8-channel 8-bit A/D, low voltage 2.7 V.5.5 V, I2C, 2 UARTs, 16 MB address range
中文描述： 16-BIT, OTPROM, 30 MHz, MICROCONTROLLER, PQFP80
封裝： 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-315-1, LQFP-80
文件頁(yè)數(shù)： 16/52頁(yè)
文件大?。?/td> 295K
代理商： PXAS37KFBE
Philips Semiconductors
XA 16-bit microcontroller
32 K/1 K OTP/ROM/ROMless, 8-channel 8-bit A/D, low voltage (2.7 V–5.5 V),
I
2
C, 2 UARTs, 16 MB address range
Preliminary specification
XA-S3
2000 Dec 01
16
Table 3. A/D Timing Configuration for 10-bit Mode
ADCFG 3 0
ADCFG.3–0
Max. Oscillator
Frequency (MHz)
Conversion Time
Sampling
(Osc. Clocks)
Osc. Clocks
μ
sec at max. Osc.
0h (0000)
6.66
88
13.21
4
1h (0001)
8
92
9.2
6
2h (0010)
8
96
8.64
8
3h (0011)
12
116
8.7
8
4h (0100)
12
120
7.2
10
5h (0101)
12
124
6.2
12
6h (0110)
12
136
6.8
24
7h (0111)
12
128
5.77
14
8h (1000)
13
148
6.35
14
9h (1001)
13
152
5.71
16
Ah (1010)
13
156
5.2
18
Bh (1011)
13
170
5.67
32
Ch (1100)
13
160
5.0
20
Dh (1101)
16
180
5.41
20
Eh (1110)
20
204
5.57
22
Fh (1111)
20
208
5.2
24
A/D Inputs
In order to obtain accurate measurements with the A/D Converter,
the source drive must be sufficient to adequately charge the
sampling capacitor during the sampling time. Figure 4 shows the
equivalent resistance and capacitance related to the A/D inputs.
A/D timing configurations indicated in Table 1 allow for full A/D
accuracy (according to the A/D specifications) assuming a source
resistance of less than or equal to 20k
. Larger source resistances
may be accommodated by increasing the sampling time with a
different A/D timing configuration.
R
S
V
ANALOG
INPUT
C
S
C
C
TO COMPARATOR
+
AD
N
AD
N+1
Sm
N+1
Sm
N
Rm
N+1
Rm
N
Multiplexer
R
m
(multiplexer resistance)
C
S
(pin capacitance)
C
C
(sampling capacitor)
R
S
(source resistance)
=
=
=
=
3 k
maximum
10 pF maximum
2 pF maximum
Recommended less than 20k
for full specified accuracy. This allows time for the sampling
capacitor (C
C
) to fully charge while the multiplexer switch is closed. Please note that sampling
causes the analog input to present a varying load to the pin.
SU00948
Figure 4. A/D Input: Equivalent Circuit
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