HD64F2357VF13 Datasheet, PDF (732/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

22.1.5 D/A Conversion Characteristics
Table 22-10 lists the D/A conversion characteristics.
Table 22-10 D/A Conversion Characteristics
Conditions: V_CC = AV_CC = 5.0 V ± 10%, V_ref = 4.5 V to AV_CC, V_SS = AV_SS = 0 V,
φ = 10 to 20 MHz, T_a = –20 to +75°C (regular specifications),
T_a = –40 to +85°C (wide-range specifications)
Item
Min
Resolution
8
Conversion time
—
Absolute accuracy
—
—
Typ
Max
Unit
8
8
bits
—
10
µs
±1.0
±1.5
LSB
—
±1.0
LSB
Test Conditions
20-pF capacitive load
2-MΩ resistive load
4-MΩ resistive load
22.2 Usage Note (Internal Voltage Step Down for the H8S/2398, H8S/2394, H8S/2392, and
H8S/2390)
The H8S/2398, H8S/2394, H8S/2392, or H8S/2390 have a voltage step down circuit that automatically lowers the power
supply voltage, inside the microcomputer, to an adequate level. A capacitor (one 0.47-µF capacitor or two 0.47-µF
capacitors connected in parallel) should be connected between the V_CL pin (a pin for internal voltage step down circuit)
and V_SS pin to stabilize the internal voltage. Figure 22-32 shows how to connect the capacitor. Do not connect the V_CC
power-supply to the V_CL pin. Doing so could permanently damage the LSI. (Connect the V_CC power-supply to the V_CC pin,
in the usual way.)
An external capacitor to
stabilize the internal voltage
V_CL
One 0.47-µF capacitor
or two 0.47-µF capacitors
connected in parallel
V_SS
Do not connect the VCC power-supply to the VCL pin.
Doing so could permanently damage the LSI.
(Connect the V_CC power-supply to the other V_CC pin in the usual way.)
Use a multilayer ceramic capacitor (one 0.47-µF capacitor or two
0.47-µF capacitors connected in parallel) for this circuit, and place it/them
near the V_CL pin.
Figure 22-32 V_CL Capacitor Connection Method
Rev.6.00 Oct.28.2004 page 702 of 1016
REJ09B0138-0600H