Atmel ATA6264 - Manual (Page 33)

33
4929B–AUTO–01/07
ATA6264 [Preliminary]
11. VPERI Power Supply
With the V
PERI
regulator a stabilized and ripple-free voltage is generated out of the VSAT supply
voltage. This voltage is intended to be used for sensitive components, for example, sensors or
reference inputs of A/D converters from microcontrollers. For this reason, a linear regulator is
implemented to guarantee high ripple rejection and a precise voltage. The regulator output is
short-circuit protected by an overcurrent protection. If pin VPERI is disconnected, the regulator
is switched off and RESQ/RESQ2 are set to low.
Figure 11-1. Functional Principle of the V
Peripheral
Regulator
If a higher current capability of the regulator is requested or if the power dissipation of the linear
regulator is too high, an external transistor can boost the regulator.
Figure 11-2. Functional Principle of the VPERI Regulator With External Boost Transistor
The VPERI voltage can be programmed via the serial interface to one of two different voltage
values during initial programming.
V
Peripheral
V
SAT
V
Peripheral
Linear regulator
VPERI
SVPERI
VSAT
V
Peripheral
V
SAT
V
Peripheral
Linear regulator
VPERI
SVPERI
VSAT