ATA6834-DK Atmel, ATA6834-DK Datasheet - Page 9

• Manufacturer Part Number: ATA6834-DK
• Description: BOARD BLDC MOTOR CTRL ATA6833/34
• Manufacturer: Atmel
• Type: MOSFET & Power Driverr

Specifications of ATA6834-DK

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6833 / ATA6834, ATmega32M1
• Primary Attributes: 3-Ph BLDC, IC with FET Driver, LIN Transceiver, Volt Regulator, Watchdog
• Secondary Attributes: LCD with Touch Screen on MCU Controller Board
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.5
9122G–AUTO–10/10
Charge Pump
Example:
Using an external resistor R
T
t
t
t
Hence, the minimum time the external microcontroller has to wait before pin WD can be trig-
gered is in worst case t
on WD pin is t
t
Other values can be set up by picking a different resistor value for R
T
Figure 3-5.
A charge pump has been implemented in order to provide sufficient voltage to operate the
external high-side power-NMOS transistors and the VG regulator, which drives the low-side
Power-NMOS transistors. The charge pump output voltage at CPOUT pin is controlled to set-
tle typically about 15V above the voltage at pin PBAT. A built-in supervisor circuit checks if the
output voltage is sufficient to operate the VG regulator and external Power-NMOS transistors.
The output voltage is accepted as good when it rises above VCP
ure is flagged at DG2 if this minimum can not be reached or if the output voltage drops below
the lower threshold of VCP
The two shuffle capacitors should have the same value. The value of the reservoir capacitor
should be at least twice the value of one shuffle capacitor. Two external shuffle capacitors and
an external reservoir capacitor have to be provided. The typical values for the two shuffle
capacitor is 100nF, and for the reservoir capacitor is 470nF. All capacitors should be ceramic.
It is advisable to pick a reservoir capacitor with twice or three-times the size of the two
equally-sized shuffle capacitors. The greater the capacitors, the greater the output current
capability.
1
2
1
max
OSC
OSC
= 980
= 780
+ t
– t
2
= 12.32µs
on the value of R
= 21.68ms ±10%
min
= 6.23ms.
T
T
OSC
OSC
max
T
OSC
= 12.07ms ±10%
= 9.609ms ±10%
= 0.9
Atmel ATA6833/ATA6834 [Preliminary]
versus R
4 0
3 0
2 0
4 5
3 5
2 5
10
15
WD
0
5
10
min
is shown in
(t
CPGOOD
= 1.1
1
WD
2 0
+ t
WD
= 33 k ±1% results in typical parameters as follows:
2
) = 19.51ms. Thus watchdog trigger input must remain within
3 0
due to overloading.
t
1
= 13.28ms. The maximum time for the watchdog trigger
Figure
4 0
R
T
WD
OSCmax
50
3-5.
(k )
(µs)
T
OSCmin
6 0
(µs)
70
8 0
9 0
CPGOOD
10 0
WD
T
OSC
. The dependency of
. A charge pump fail-
(µs)
9