MC34921 Datasheet, PDF (15/36 Pages) List of Unclassifed Manufacturers – Configurable Motor Driver IC with Power Supplies

DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics (continued)
Characteristics noted under conditions 16 V ≤ B+ ≤ 34 V, 0°C ≤ T_A ≤ 70°C, and 0°C ≤ T_J ≤ 100°C unless otherwise noted.
Typical values noted reflect the approximate parameter means at T_A = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
Supervisor Circuitry
RST Delay
V_5.0 = ≥ +4.9 V ⁽²⁴⁾
t_{delay (RST)}
128
RST Filter Time
V_5.0 = 5.0 V
t _filter
–
RST Fall Time
t_f
V_5.0 = 5.0 V, C_L = 100 pF, I_PULLUP = 0.75 mA(external), 90% to 10% of
–
V_5.0
External Input Low to RST Pulled Low
V_5.0 = 5.0 V ⁽²⁵⁾
t _slpl
–
–
3.25
7.0
26
t_SCLK
128
µs
–
ns
20
ns
60
Analog Encoder Interface Variable Gain Stage
Adjustable Gain (Ideal)
Settings S = 0 to 15, Default 0
Settings S = 16 to 31, Default 0
Gain
Setting = 0
Setting = 31
Gain Step Factor Tolerance
Gain Step Size Gs/G(s-₁) S = 1 to 31
G (Ideal)
G
GSF
(1.0+0.1 _* S)
(1.0+0.1 _* [S-16]) / 0.375
V/V
0.8
1.0
1.2
6.0
6.6
7.2
V/V
1.01
1.02
1.2
Analog Encoder Interface Digital Signal Conversion Stage
Operating Frequency
Comparator Filter Time⁽²⁴⁾
Filter Configuration Bit Set to 0
Filter Configuration Bit Set to 1
f _OP(MAX)
0
–
15
kHz
t _filter
SCLK
3.0
–
4.0
Cycles
6.0
–
7.0
ADC
Sample and Hold Acquisition Time
A/D Speed Bit = 0
A/D Speed Bit = 1
t _sh
t_SCLK
15
–
16
31
–
32
Conversion Time (Return Word Clocked Out Immediately Following t_c )
t_c
A/D Speed Bit = 0
A/D Speed Bit = 1
t_SCLK
–
–
48
–
–
96
Master Oscillator
Operating Frequency
B+ ≥ 12 V
Notes
24. Guaranteed by design.
25. See Figure 6, RST Timing, page 17.
f _OP
kHz
150
200
250
Analog Integrated Circuit Device Data
Freescale Semiconductor
34921
15