CY8C5466AXI-064 Cypress Semiconductor Corp, CY8C5466AXI-064 Datasheet - Page 50

• Manufacturer Part Number: CY8C5466AXI-064
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY8C5466AXI-064

• Lead Free Status / Rohs Status: Compliant

8.5.3 PGA
The PGA amplifies an external or internal signal. The PGA can
be configured to operate in inverting mode or noninverting mode.
The PGA function may be configured for both positive and
negative gains as high as 50 and 49 respectively. The gain is
adjusted by changing the values of R1 and R2 as illustrated in
Figure
and possible resistor settings for the PGA. The gain is switched
from inverting and non inverting by changing the shared select
value of the both the input muxes. The bandwidth for each gain
case is listed in
Table 8-2. Bandwidth
Figure 8-7. PGA Resistor Settings
The PGA is used in applications where the input signal may not
be large enough to achieve the desired resolution in the ADC, or
dynamic range of another SC/CT block such as a mixer. The gain
is adjustable at runtime, including changing the gain of the PGA
prior to each ADC sample.
8.5.4 TIA
The Transimpedance Amplifier (TIA) converts an internal or
external current to an output voltage. The TIA uses an internal
feedback resistor in a continuous time configuration to convert
input current to output voltage. For an input current I
voltage is V
non inverting input. The feedback resistor Rfb is programmable
between 20 KΩ and 1 MΩ through a configuration register.
Table 8-3
configuration settings.
Document Number: 001-66238 Rev. *A
V
V
V
V
S
in
ref
ref
in
Gain
8-7. The schematic in
24
48
50
1
0
1
0
1
shows the possible values of Rfb and associated
REF
- I
Table
20 k or 40 k
in
R1
x R
8-2.
fb
, where V
Bandwidth
6.0 MHz
340 kHz
220 kHz
215 kHz
Figure 8-7
REF
is the value placed on the
R2
shows the configuration
20 k to 980 k
PRELIMINARY
in
, the output
Table 8-3. Feedback Resistor Settings
Figure 8-8. Continuous Time TIA Schematic
The TIA configuration is used for applications where an external
sensor's output is current as a function of some type of stimulus
such as temperature, light, magnetic flux etc. In a common
application, the voltage DAC output can be connected to the
V
current by adjusting the voltage DAC output voltage.
8.6 LCD Direct Drive
The PSoC Liquid Crystal Display (LCD) driver system is a highly
configurable peripheral designed to allow PSoC to directly drive
a broad range of LCD glass. All voltages are generated on chip,
eliminating the need for external components. With a high
multiplex ratio of up to 1/16, the CY8C54 family LCD driver
system can drive a maximum of 736 segments. The PSoC LCD
driver module was also designed with the conservative power
budget of portable devices in mind, enabling different LCD drive
modes and power down modes to conserve power.
PSoC Creator provides an LCD segment drive component. The
component wizard provides easy and flexible configuration of
LCD resources. You can specify pins for segments and
commons along with other options. The software configures the
device to meet the required specifications. This is possible
because of the programmability inherent to PSoC devices.
Key features of the PSoC LCD segment system are:
V ref
REF
LCD panel direct driving
Type A (standard) and Type B (low power) waveform support
Wide operating voltage range support (2 V to 5 V) for LCD
panels
Static, 1/2, 1/3, 1/4, 1/5 bias voltage levels
I in
Configuration Word
PSoC
TIA input to allow calibration of the external sensor bias
000b
001b
010b
011b
100b
101b
110b
111b
®
5: CY8C54 Family Datasheet
Nominal R
R fb
1000
120
250
500
20
30
40
60
fb
(
K Ω
Page 50 of 105
)
V out
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