12-BIT µP-COMPATIBLE
ANALOG-TO-DIGITAL CONVERTERS
TC7109
TC7109A
ZERO CROSSING OCCURS
ZERO CROSSING DETECTED
INTEGRATOR
OUTPUT
INTERNAL CLOCK
INTERNAL LATCH
STATUS OUTPUT
MODE INPUT
UART
NORM
TERMINATES
UART MODE
MODE LOW,
NOT IN
SEND SENSED
SEND SENSED
INTERNAL MODE
SEND INPUT
CE/LOAD
HANDSHAKE
MODE
DISABLES
OUTPUTS
CE/LOAD,
HBEN,
HBEN
LBEN
HIGH-BYTE DATA
LBEN
DATA VALID
MODE HIGH ACTIVATES
CE/LOAD, HBEN, LBEN
LOW-BYTE DATA
DATA VALID
THREE-STATE
THREE-STATE
HIGH IMPEDANCE
=
=
= DON'T CARE
WITH PULL-UP
Figure 7. TC7109A Handshake With SEND INPUT Held Positive
ZERO CROSSING OCCURS
ZERO CROSSING DETECTED
INTEGRATOR OUTPUT
INTERNAL CLOCK
INTERNAL LATCH
STATUS OUTPUT
MODE INPUT
UART
NORM
TERMINATES
UART MODE
SEND
SENSED
SEND
SENSED
SEND
SENSED
INTERNAL MODE
SEND INPUT (UART TBRE)
CE/LOAD OUTPUT (UART TBRL)
HBEN
HIGH-BYTE DATA
LBEN
DATA VALID
LOW-BYTE DATA
DATA VALID
THREE-STATE HIGH IMPEDANCE
Figure 8. TC7109A Handshake — Typical UART Interface Timing
=
= DON'T CARE
3-102
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
