pic32mx320f064h Microchip Technology Inc., pic32mx320f064h Datasheet - Page 465

• Manufacturer Part Number: pic32mx320f064h
• Description: 64/100-pin General Purpose, 32-bit Flash Microcontrollers
• Manufacturer: Microchip Technology Inc.

24.2.1
The full range of voltage reference cannot be realized
due to the construction of the module. The transistors
on the top and bottom of the resistor ladder network
(Figure 24-1) keep
approaching the reference source rails. The voltage
reference is derived from the reference source; there-
fore, the voltage reference output changes with
fluctuations in that source. Refer to the product data
sheet for the electrical specifications. Table 24-3
contains the typical output impedances for the CV
module.
TABLE 24-3:
24.2.2
This initialization sequence, shown in Example 24-1,
configures the CV
put enabled, high range, and set output for maximum
(2.37V).
EXAMPLE 24-1:
© 2007 Microchip Technology Inc.
CVRCON = 0x804F;
CVR<3:0>
CV
INITIALIZATION
REF
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
REF
TYPICAL CV
OUTPUT CONSIDERATIONS
module for: module enabled, out-
the
VOLTAGE REFERENCE CONFIGURATION
voltage
//Initialize Voltage Reference Module
//enable module, enable output, set
// range to high, set output to maximum
REF
OUTPUT IMPEDANCE IN OHMS
reference from
CVRR = 0 (CVRCON <5>)
Advance Information
REF
13.8k
14.4k
15.4k
15.8k
15.9k
15.9k
15.8k
15.4k
14.4k
13.8k
12.9k
12k
13k
15k
16k
15k
Voltage Reference
PIC32MX FAMILY
CVRR = 1 (CVRCON <5>
10.7k
11.3k
11.7k
11.9k
11.9k
11.7k
11.3k
1.9k
3.7k
5.3k
6.7k
7.9k
9.9k
500
12k
9k
DS61143A-page 463