Specifications

Cerebus
TM
Stim Switch Users Manual
Rev. 1.00 Page 4
LB-0265
plugging in the Stim Switch for the first time. There are also two fuses in the power supply that
may need to be replaced if the Power Supply is connected to the wrong voltage.
2.2 Stim Switch Headstage Module
The Headstage Module provides connection
between the Cerebus Front End Amplifier, the
electrodes, and the Stim Switch. LEDs on the
module indicate power (1), blanking enabled (2), and
stimulation enabled (3).
The Headstage Module is connected to the Stim
Switch with the Headstage Module Cable. The
power switch on the Stim Switch should always
be turned off prior to connecting or
disconnecting the headstage module cable.
The Headstage Module is built around connectors
from Samtec (www.samtec.com) and is designed to
mate with the ICS family of array holders from
Blackrock Microsystems. Please refer to the
Cerebus User Manual or contact a Blackrock sales
representative for more information on the
different connectors available for use with the Stim
Switch headstage module.
Each Channel on the Headstage Module is rated for
a maximum voltage of ±15 V with respect and
ground and can source or sink a maximum of 30 mA
of current. The diagram on the right illustrates the
internal connections of a single channel in the
Headstage Module. The Amplifier Blanking Switch is
closed during Read mode and open during
Stimulation and Blanking modes. The Stimulator
switch is only closed when the Headstage Module is
configured in Stimulation mode and the channel has
been selected for Stimulation using the StimComm
software. The table below defines the state of each
switch for a single channel for any given set of inputs.
Table 2-2: Headstage Module switching states
Channel State Amplifier Blanking Switch Stimulator Switch
Read Closed Open
Blanking Open Open
Stimulation (channel not set for stimulation) Open Open
Stimulation (channel set for stimulation) Open Closed
Figure 2-5 Stim Switch Headstage Module
Figure 2-6: Switch Schematic.
R
stim
= 500 MΩ and R
elec
= 1kΩ