TS3005
PIN FUNCTIONS
PIN
1
NAME
FOUT
FUNCTION
Fixed Frequency Output. A push-pull output stage with an
output resistance of 160Ω. FOUT pin swings from GND to
VDD. For lowest power operation, capacitance loads should
be minimized and resistive loads should be maximized.
Frequency Divider Input. Various combinations of these
inputs will change the FOUT frequency for a fixed value of
RSET. Refer to Table 1.
Pulse-width Modulated Output. A push-pull output stage with
an output resistance of 160Ω, the PWMOUT pin is wired
anti-phase with respect to FOUT and swings from GND to
VDD. For lowest power operation, capacitance loads should
be minimized and resistive loads should be maximized.
PWM Output Pulse Control Pin. Applying a voltage between
GND and V
RSET
will reduce the duty cycle of the PWMOUT
output that is set by the capacitor connected to the CPWM
pin. Connect PWM_CNTRL to VDD for fixed PWMOUT
output pulse time (determined only by capacitor at CPWM).
Ground. Connect this pin to the system’s analog ground
plane.
PWMOUT Pulse Width Programming Capacitance Input. A
target capacitance connected from this pin to GND sets the
duty cycle of the PMW output. Minimize any stray
capacitance on this pin. The voltage on this pin will swing
from GND to V
RSET
. Connect CPWM to VDD to disable PWM
function (saves PWM current).
Power Supply Voltage Input. The supply voltage range is
1.55V ≤ V
DD
≤ 5.25V. Bypass this pin with a 0.1uF ceramic
coupling capacitor in close proximity to the TS3005.
FOUT Programming Resistor Input. A 4.32MOhm resistor
connected from this pin to ground sets the T3005’s internal
oscillator’s output period to 20ms (49Hz). For optimal
performance, the composition of the RSET resistor shall be
consistent with a tolerance of 1% or lower. The RSET pin
voltage is approximately 0.3V.
2,3,4
FDIV2:0
5
PWMOUT
6
PWM_CNTRL
7
GND
8
CPWM
9
VDD
10
RSET
Page 6
TS3005DS r1p0
RTFDS
TOUCHSTONE [ TOUCHSTONE SEMICONDUCTOR INC ]
