HT46R064G/065G/0662G
Enhanced A/D Type 8-Bit OTP MCU with OPA
Operational Amplifiers
There are two fully integrated Operational Amplifiers in these devices, OPA0 and OPA1. These OPAs
can be used for user specified analog signal processing. The OPAs can be disabled or enabled entirely
under software control using internal registers. With specific control registers, some OPA related
applications can be easily implemented, such as Unity Gain Buffer, Non-Inverting Amplifier,
Inverting Amplifier and various kinds of filters, etc.
Comparator & Operational Amplifier Registers
The internal Operational Amplifiers are fully under the control of internal registers, COPA0C,
COPA1C, COPA2C, COPA3C, OPA0OC and OPA1OC. These registers control the enable/disable
function, input path selection, gain control, polarity and calibration function.
Operational Amplifier Operation
The advantages of multiple switches and input path options, various reference voltage selection, up to 8
kinds of internal software gain control, output with interrupt function, offset reference voltage calibration
function and power down control for low power consumption enhance the flexibility of these two OPAs
to suit a wide range of application possibilities.
Note that the EA0I, EA1I interrupt control bits should be set to ²0² before entering halt mode for
power saving.
The following block diagram illustrates the main functional blocks of the OPAs and Comparator in this
device.
S12
EA0I
S11
A0N
A0X
To OPA0 interrupt
A0
A0P
0.7VDD
0.5VDD
0.1VDD
MA0P
MUX
A0PS[2:0]
A1NS[1:0]
S13
A0X
S21
R1
10K
S22
S23
R2
500K
MA1N
A1N
A1P
MUX
EA1I
A1X
To OPA1 interrupt
A1
0.7VDD
0.5VDD
0.1VDD
MA1P
MUX
CINTS[1:0]
=00: rasing edge
=01: falling edge
=10: both edge
A1PS[2:0]
CNS[1:0]
Edge
control
S24
to interrupt
A1X
TC0 pin
MCN
MUX
POL
CN
CP
mux
To timer 0 external
clock input
debounce
C
CX
(COUT)
TMR0S
0.7VDD
0.5VDD
0.1VDD
MCP
MUX
CPS[2:0]
CX
Rev. 1.00
77
March 3, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
