HD64F7047F50 Renesas Electronics America, HD64F7047F50 Datasheet - Page 436

• Manufacturer Part Number: HD64F7047F50
• Description: IC SUPERH MCU FLASH 256K 100QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7047r

Specifications of HD64F7047F50

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

13.7
13.7.1
Operation of the A/D converter can be disabled or enabled using the module standby control
register. The initial setting is for operation of the A/D converter to be halted. Register access is
enabled by clearing module standby mode. For details, refer to section 24, Power-Down Modes.
13.7.2
This LSI's analog input is designed such that conversion accuracy is guaranteed for an input signal
for which the signal source impedance is 1 kΩ or less (20 MHz to 25 MHz) or 3 kΩ or less
(20MHz or less). This specification is provided to enable the A/D converter's sample-and-hold
circuit input capacitance to be charged within the sampling time; if the sensor output impedance
exceeds 1 kΩ or 3 kΩ, charging may be insufficient and it may not be possible to guarantee A/D
conversion accuracy. However, for A/D conversion in single mode with a large capacitance
provided externally, the input load will essentially comprise only the internal input resistance of
10 kΩ, and the signal source impedance is ignored. However, as a low-pass filter effect is obtained
in this case, it may not be possible to follow an analog signal with a large differential coefficient
(e.g., 5 mV/µs or greater) (see figure 13.6). When converting a high-speed analog signal or
converting in scan mode, a low-impedance buffer should be inserted.
13.7.3
Adding capacitance results in coupling with GND, and therefore noise in GND may adversely
affect absolute precision. Be sure to make the connection to an electrically stable GND such as
AVss.
Care is also required to insure that filter circuits do not interfere in the accuracy by the digital
signals on the printed circuit board (i.e, acting as antennas).
Rev. 2.00, 09/04, page 394 of 720
Usage Notes
Module Standby Mode Setting
Permissible Signal Source Impedance
Influences on Absolute Accuracy
Sensor input
Sensor output
impedance of
up to 3 kΩ or
up to 1 kΩ
Low-pass
filter
C to 0.1 µF
Figure 13.6 Example of Analog Input Circuit
This LSI
C
15 pF
in
=
A/D converter
equivalent circuit
10 kΩ
20 pF