HC55185EVAL1 Intersil, HC55185EVAL1 Datasheet - Page 3

• Manufacturer Part Number: HC55185EVAL1
• Manufacturer: Intersil

Test Points
Each connector interface to the evaluation board has a test
point. All test points are DC coupled and should be guarded
against ground shorts. High impedance test inputs, such as
oscilloscopes or DVMs, should be used to monitor these
points. Unused BNC connections also provide convenient
test point access.
Toggle Switches
The six toggle switches, S1 thru S6, interface directly to the
HC55185 device. Positioning any switch towards the top of
the board is a logic “1”. Positioning any switch towards the
bottom of the board is a logic “0”. All switches are labeled
with the control signal name of the HC5518x device.
The switch E0 selects the switch hook (E0 = 1) or the ground
key detector (E0 = 0) to appear at DET. During ringing, the
device overrides E0 and sends the ring trip detector to DET.
The switched labeled SWC turns on the uncommitted switch
when set to a logic low. The battery select signal BSEL,
selects the high battery when set to logic high. The operating
modes for the HC55185 device are provided in Table 1.
Evaluation Board Connector Descriptions
CONNECTOR
J10
J11
J12
J13
J14
J15
J1
J2
J3
J4
J5
J6
J7
J8
J9
RJ11 type phone connector.
Ring terminal of board.
Tip terminal of board.
Grounding lug connected to board ground plane.
1: V
2: V
3: V
4: +5V. Positive 5V supply to the HC55185 device and LEDs (green wire).
7 thru 10: GND. Twisted pair returns for external supply connections (black wires).
Identical pinout as J5. Either connector provides daisy chain connection to second board for back to back evaluation.
Transmit analog output from HC55185 device, VTX. This path is AC coupled by C
Receive analog input to HC55185 device, VREC. This path is AC coupled by C
Ringing input to HC55185 device, VRS. This path is AC coupled by C
Serial transmit data output of CODEC U6.
Serial receive data input to CODEC U6.
Common frame sync input for receive and transmit digital data.
Common clock for CODEC data transfer and conversion.
20 pin, 100 mil spacing header with all digital PCM data interfaces to CODEC U6.
20 pin, 100 mil spacing header with all digital interfaces to HC55185 device.
CC
BH
BL
. Low negative battery supply to the HC55185 device (yellow wire).
. Positive 5V supply to CODEC U6, clock generator U5 and logic devices U2 thru U4 (red wire).
. High negative battery supply to the HC55185 device (orange wire).
4-3
Application Note 9814
DESCRIPTION
NOTE: The HC55185 device should always operate from low battery
voltage when using the Forward Loop Back mode.
Refer to the device electrical data sheet for detailed
descriptions regarding each operating mode according to
the device under evaluation.
Low Power Standby
Forward Active
Unused
Reverse Active
Ringing
Forward Loop Back (Note)
Tip Open
Power Denial
OPERATING MODE
RS
TABLE 1. HC55185 OPERATING MODES
.
RX
TX
.
.
F2
0
0
0
0
1
1
1
1
F1
0
0
1
1
0
0
1
1
F0
0
1
0
1
0
1
0
1