Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 38

• Manufacturer Part Number: Z86D99
• Description: Low-Voltage Micro controllers with ADC
• Manufacturer: ZILOG [Zilog, Inc.]

PS003807-1002
Note:
Though the ADC functions for smaller input voltage range (V
and offsets remain constant over the specified electrical range. The errors of the
converter increase due to small input signals.
For fast access to the output of the ADC, the current data is available in the ADC
result register (r8, bank00).
To reduce the interference between the digital part and the analog part, separate
AV
Active Glitch Filter
The Z86D99/Z86L99 family incorporates an active power/glitch filter that can be
used to improve the quality of the power supply when the device is operating in
noisy environments. The chips use three separate power buses:
•
•
•
Depending on the pin availability, one or more of the power buses are connected
together.
The active power filter can be used in the packages that have the V
Figure 16 shows the internal schematic.
SS
pad ring power bus (all the output drivers plus the crystal/RC oscillator) called
V
core power bus (all digital circuitry) called V
analog power bus (all analog circuitry) called AV
DD_padring
and AV
In the smaller packages, which do not support the ADC, the
user must keep the converter not active in order to not have
power dissipated in the ADC block. By default, ADC is off.
DD
pins are available on the packages where the ADC can be used.
P
R
E
L
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
I
Low-Voltage Microcontrollers with ADC
N
A
DD_CORE
R
DD
Y
Ref+
–V
Ref-
DD
), the noise
separate.
31