ATA6823 ATMEL Corporation, ATA6823 Datasheet - Page 5

• Manufacturer Part Number: ATA6823
• Description: H-bridge Motor Driver
• Manufacturer: ATMEL Corporation

4. Application
4.1
5. Functional Description
5.1
5.1.1
4856E–AUTO–07/07
General Remark
Power Supply Unit with Supervisor Functions
Power Supply
This chapter describes the principal application for which the ATA6823 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
A fully-internal low-power and low-drop regulator, stabilized by an external blocking capacitor
provides the necessary low-voltage supply needed for 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 going to sleep mode, VBATSW turns OFF. 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
LIN
The internal supply voltage V
Typical External Components
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 LIN bus
Figure 1-1 on page
INT
must not be used for any other supply purpose!
2).
ATA6823 [Preliminary]
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
Tolerance
10%
10%
10%
10%
10%
1%
10%
5