ATA6824_08 ATMEL [ATMEL Corporation], ATA6824_08 Datasheet - Page 5

• Manufacturer Part Number: ATA6824_08
• Description: High Temperature H-bridge Motor Driver
• Manufacturer: ATMEL [ATMEL Corporation]

4. Application
4.1
5. Functional Description
5.1
5.1.1
4931E–AUTO–01/08
General Remark
Power Supply Unit with Supervisor Functions
Power Supply
This chapter describes the principal application for which the ATA6824 was designed. Because
Atmel cannot be considered to understand fully all aspects of the system, application and envi-
ronment, no warranties of fitness for a particular purpose are given.
Table 4-1.
The IC is supplied by a reverse-protected battery voltage. To prevent it from destruction, proper
external protection circuitry has to be added. It is recommended to use at least a capacitor com-
bination of storage and HF caps behind the reverse protection circuitry and closed to the VBAT
pin of the IC (see
An internal low-power and low drop regulator (V
provides the necessary low-voltage supply for all internal blocks except the digital IO pins. This
voltage is also needed in the wake-up process. The low-power band gap reference is trimmed
and is used for the bigger VCC regulator, too. All internal blocks are supplied by the internal
regulator.
Note:
Nothing inside the IC except the logic interface to the microcontroller is supplied by the 5V/3.3V
VCC regulator.
A power-good comparator checks the output voltage of the V
chip in reset as long as the voltage is too low.
There is a high-voltage switch which brings out the battery voltage to the pin VBATSW for mea-
surement purposes. This switch is switched ON for VCC = HIGH and stays ON in case of a
watchdog reset. The signal can be used to switch on external voltage regulators, etc.
Component
C
C
C
R
C
C
C
R
C
VINT
VCC
CC
CC
VG
CP
VRES
RWD
SIO
The internal supply voltage V
Typical External Components (See also
Function
Blocking capacitor at VINT
Blocking capacitor at VCC
Cross conduction time definition capacitor
Cross conduction time definition resistor
Blocking capacitor at VG
Charge pump capacitor
Reservoir capacitor
Watchdog time definition resistor
Filter capacitor for serial interface
Figure 1-1 on page
INT
must not be used for any other supply purpose!
2).
INT
), stabilized by an external blocking capacitor,
Figure 1-1 on page
Value
220 nF, 10V, X7R
2.2 µF, 10V, X7R
Typical 330 pF, 100V, COG
Typical 10 k
470 nF, 25V, X7R
220 nF, 25V, X7R
470 nF, 25V, X7R
Typical 51 k
Typical 220 pF, 100V
INT
regulator and keeps the whole
2)
ATA6824
Tolerance
10%
10%
10%
10%
10%
1%
10%
5