ES51999
4 3/4 and 5 3/4 A/D AUTO
Conversion time
C[0] = 0 C[0] = 1
Range
40Hz
400Hz
0.8s ~ 2s
0.16s ~ 0.4s
0.16s ~ 0.4s
4000Hz
40KHz
400KHz
4MHz
110ms
1.1s
1.1s
1.1s
1.1s
1.1s
110ms
110ms
110ms
110ms
40MHz
400MHz
(10)Voltage/Current Measurement with Frequency Counter
When F[0:2] = “001” or “011”, ES51999 measures frequency of input together with
voltage/current. At this measurement mode, voltage (or current) input is VR1/400mV (or
IVSH/IVSL), and frequency input is FREQ. Q[0:2] is the range of voltage/current
measurement, and C[0:2] is the range of frequency measurement. Only 40K to 400MHz
ranges are selectable here. Unlike frequency measurement (F[0:2] = “110”), duty cycle is
not measured in this mode. The conversion time is fixed at 110ms. Voltage/current can
count up to 54,000 (or 540,000 when 10MHz OSC is used). AC and PEAK can still be
active. D0 is the output of voltage/current, and (10×D1) is the result of frequency.
(11) SLEEP mode
If SLEEP bit is set ‘H’ by uP, ES51999 enters sleep mode. In sleep mode, if SCLK keeps
low, all the circuit is shut down, and the supply current is about 0.1uA. If SCLK is high
in sleep mode, only the oscillator is active to prepare for the following re-power
operation.
(12) Digital Signals Rising and Falling times
The digital signals include EOC, SCLK, and STATUS, and those rising and falling times
are defined as follow:
EOC and STATUS are output to microprocessor:
V+
(V-)+2.1V
(V-)+0.8V
V-
tfo
tro
17
07/07/06
CYRUSTEK [ Cyrustek corporation ]
